AudioCircle

Audio/Video Gear and Systems => The Lab => Topic started by: JoshK on 26 Feb 2009, 04:37 pm

Title: What equipment have you built recently?
Post by: JoshK on 26 Feb 2009, 04:37 pm
Audio central has a thread on what equipment have you bought recently with folks posting pictures of their new toys.  How about for those of us who build rather than buy our gear?  Although, pictures of cool drivers and iron, tubes and other diy wares would be cool too.

This might be a nice thread to brag and show off your latest project. 

So guys, what have you built lately?
Title: Re: What equipment have you built recently?
Post by: sts9fan on 26 Feb 2009, 04:44 pm
My Zen Variation 9.  Already posted it but what the hell...
(http://thumb2.webshots.net/t/63/563/0/8/47/2458008470086056042vLaNOb_th.jpg) (http://travel.webshots.com/photo/2458008470086056042vLaNOb)

(http://thumb2.webshots.net/t/52/752/9/83/0/2677983000086056042ZOKSJl_th.jpg) (http://travel.webshots.com/photo/2677983000086056042ZOKSJl)
Testing on the "work bench"
(http://thumb2.webshots.net/t/69/669/9/57/88/2166957880086056042jeipMU_th.jpg) (http://travel.webshots.com/photo/2166957880086056042jeipMU)
Title: Re: What equipment have you built recently?
Post by: JoshK on 26 Feb 2009, 04:47 pm
This just gives a nice central place to see everybody's stuff. 

My already posted E-linear KT88 SE amp.

(http://www.audiocircle.com/image.php?id=18107)
Title: Re: What equipment have you built recently?
Post by: whubbard on 26 Feb 2009, 05:39 pm
Well,
My Full System basically.
Orion+ Loudspeakers
Aspen Lifeforce 100, 55, 55 (with mods)
Aspen Gk-1 (with mods)

Also a Peter Daniel S/PDIF Dac, but I still need a case for it.

-West

EDIT:
Build Thread Here (http://www.audiocircle.com/index.php?topic=56401.0)
Title: Re: What equipment have you built recently?
Post by: EDS_ on 26 Feb 2009, 05:41 pm
Quote from: JoshK on 26 Feb 2009, 04:47 pm
This just gives a nice central place to see everybody's stuff. 

My already posted E-linear KT88 SE amp.

(http://www.audiocircle.com/image.php?id=18107)

Damnation Josh, that is awesome.  I've got a serious Jones for a SE KT - 88 amp.
Title: Re: What equipment have you built recently?
Post by: mgalusha on 26 Feb 2009, 05:56 pm
I lust for that amp every time I see it Josh, simply gorgeous.

Recent projects...

Geddes Abbey speakers. I will finish them once spring arrives but I am very happy with the sound.

(http://www.audiocircle.com/image.php?id=18464)


I built a new analog section for a friends Transporter, it turned out pretty well.

(http://www.audiocircle.com/image.php?id=18465)
Title: Re: What equipment have you built recently?
Post by: rajacat on 26 Feb 2009, 06:09 pm
So when are you going to submit an extensive review of your Geddes Abbey speakers? :green: I suppose you can't review your own work on the Transporter. :wink:

-Roy

Title: Re: What equipment have you built recently?
Post by: mgalusha on 26 Feb 2009, 06:24 pm
Quote from: rajacat on 26 Feb 2009, 06:09 pm
So when are you going to submit an extensive review of your Geddes Abbey speakers? :green: I suppose you can't review your own work on the Transporter. :wink:

Roy,

I submitted the review to Steven at Enjoy the Music for the March DIY section, I have no idea if he's going to publish it.

I'll ask the owner of the TP to post a comment but last time I talked to him he was happy with it. If the Transporter were mine I would likely have kept tinkering for another few months but I kept him waiting a long time as it was. :)

Edit: I just checked Enjoy the Music and Steven did post my Abbey review. :D http://www.enjoythemusic.com/diy/0309/gedlee_abbey.htm

Title: Re: What equipment have you built recently?
Post by: rajacat on 26 Feb 2009, 06:32 pm
Thanks Mike!
Title: Re: What equipment have you built recently?
Post by: ohenry on 26 Feb 2009, 06:49 pm
A few months ago, I built the little Spud 6cl6 amp as listed on the Hawthorne Audio site.  I've recently replaced the small Edcor output transformers pictured below with some heavier ones from Transcendar.  Now the bass is as good as the highs, but I have to find a larger case to house everything.   :roll:

This was an inexpensive and fun project for those wanting an easy intro into tube amps with point-to-point wiring.  And the chassis is pre-drilled and finished, you only need to add sides (unless you can't resist those bigger transformers).  :icon_lol:

(http://www.audiocircle.com/image.php?id=18466)
Title: Re: What equipment have you built recently?
Post by: mgalusha on 26 Feb 2009, 06:52 pm
Quote from: ohenry on 26 Feb 2009, 06:49 pm
(http://www.audiocircle.com/image.php?id=18466)

Nicely done.  :thumb:
Title: Re: What equipment have you built recently?
Post by: rajacat on 26 Feb 2009, 07:17 pm
Mike,

Nice review. :thumb: I liked that you included your modifications to the stock kit. You seemed very objective and pointed out the minor deficiencies while not gushing inordinately about the many positive aspects of the design.

Have you played much symphonic music through the Abbys yet? You mentioned that they had great clarity so would this apply to very dense music?   How well they handle the imaging demands of orchestral music. Are the various groups of instruments easily located? Certainly they would have no trouble with the dynamics.

Thanks,

Roy

p.s. Perhaps these speakers need a separate thread. Whoops :oops:, I just noticed that there is a Geddes thread already.
Title: Re: What equipment have you built recently?
Post by: JoshK on 26 Feb 2009, 07:23 pm
Excellent review Mike.  :thumb:  Pretty much sums up what I heard when I was at Geddes'.  Another thing I noticed was that due to lack of distortion we were playing at much higher levels that I perceived.  Do you find yourself playing any louder?
Title: Re: What equipment have you built recently?
Post by: mgalusha on 26 Feb 2009, 07:59 pm
Quote from: JoshK on 26 Feb 2009, 07:23 pm
Excellent review Mike.  :thumb:  Pretty much sums up what I heard when I was at Geddes'.  Another thing I noticed was that due to lack of distortion we were playing at much higher levels that I perceived.  Do you find yourself playing any louder?

Oh yeah, I have to be conscious of the level and not go overboard. The seeming lack of distortion and compression unfortunately encourages turning it up. :) Of course part of how I judge equipment is when something makes me want to turn it down, regardless of level, it has to go.
Title: Re: What equipment have you built recently?
Post by: BillB on 26 Feb 2009, 08:00 pm
Henry,

What model Edcors did you use? I have heard of people measuring to 30hz with the standard ones and when all is said and done they are more or less full-range.

I used the GSXE on my SE amp and it definitely has no lack of bottom end.

I will post pics of my projects when I get home.
Title: Re: What equipment have you built recently?
Post by: BradJudy on 26 Feb 2009, 08:13 pm
I built this Pass DIY B1 recently:

(http://bradjudy.smugmug.com/photos/431335185_pjcZ2-M.jpg)

My current DIY project is for the Eye-fidelity circle - I'll be sure to post there when it's done.  :)
Title: Re: What equipment have you built recently?
Post by: BillB on 26 Feb 2009, 11:56 pm
My 6T9 SE amp:

(http://img213.imageshack.us/img213/5595/dsc09191tmj3.jpg)

Closeup of feedback switch and carbon fiber top:

(http://img405.imageshack.us/img405/1116/dsc09199ska8.jpg)

Variable negative feedback uses Riken resistors (I had some lying around), Cathode cap is an organic polymer electrolytic

(http://img80.imageshack.us/img80/5990/dsc09198sbq1.jpg)

The Euterpe preamp:

(http://img510.imageshack.us/img510/3107/dsc09235ac0.jpg)

Title: Re: What equipment have you built recently?
Post by: ohenry on 27 Feb 2009, 12:57 am
Quote from: BillB on 26 Feb 2009, 08:00 pm
Henry,

What model Edcors did you use? I have heard of people measuring to 30hz with the standard ones and when all is said and done they are more or less full-range.

I used the GSXE on my SE amp and it definitely has no lack of bottom end.

I will post pics of my projects when I get home.

Hi Bill,
I used the ones provided in the kit, I believe they were XSE10-8-8K (10 watt, 8k resistance).  Compared to my Carina and other amps, it was obvious that while these produced bass, they just didn't have the heft.  I ordered the Transcendar 10 watt, 8k and the difference in tone is very noticeable and desirable for me.

Many Spud guys are running the big 15" Silver Iris speakers and maybe in that application the Spud isn't bass shy.  Regardless, it's a great little amp and it's a keeper for me.
Title: Re: What equipment have you built recently?
Post by: BillB on 27 Feb 2009, 01:14 am
If you get randy sometime I can highly recommend the 6T9 compactron.

They put out about the same wattage SE as the spud (6t9 is a 12w pentode and a triode) but the bass weight and sound impressed me much more...I had a Spud at the house for a short time and it was very warm in the mids but not much elsewhere...this was before they switched to Edcors though.

Glad you found bliss in the new transformers!
Title: Re: What equipment have you built recently?
Post by: dweekie on 27 Feb 2009, 05:58 am
Quote from: ohenry on 27 Feb 2009, 12:57 am
Quote from: BillB on 26 Feb 2009, 08:00 pm
Henry,

What model Edcors did you use? I have heard of people measuring to 30hz with the standard ones and when all is said and done they are more or less full-range.

I used the GSXE on my SE amp and it definitely has no lack of bottom end.

I will post pics of my projects when I get home.

Hi Bill,
I used the ones provided in the kit, I believe they were XSE10-8-8K (10 watt, 8k resistance).  Compared to my Carina and other amps, it was obvious that while these produced bass, they just didn't have the heft.  I ordered the Transcendar 10 watt, 8k and the difference in tone is very noticeable and desirable for me.

Many Spud guys are running the big 15" Silver Iris speakers and maybe in that application the Spud isn't bass shy.  Regardless, it's a great little amp and it's a keeper for me.

I'm pretty sure the XSE10 8-8K was original release that I have now, and by the looks of your chassis, it should have come with a replacement model designed for a bit lower frequency response.  I followed your thread on the transformer upgrade; very nice indeed. 

I'm still drooling over a Carina... why can't I just get myself to sell off my DIY projects and just get one :duh:
Title: Re: What equipment have you built recently?
Post by: BobM on 27 Feb 2009, 12:57 pm
I really envy you guys hand building tube amps and tube preamps. I never got into that end of the DIY world, but someday I might. Nice stuff there fellas. I'm sure it sounds wonderful.

Bob
Title: Re: What equipment have you built recently?
Post by: BillB on 28 Feb 2009, 05:51 am
Even if it's crap we convince ourselves otherwise.  :lol:
Title: Re: What equipment have you built recently?
Post by: TomS on 2 Mar 2009, 04:09 am
Oh, does "almost done" count? 

This is my DIYAudio "Pumpkin/Shunty" dual mono balanced preamp with dual shunt regulated power supplies. The AC supply will be separately housed with the dual toroids shown and built in Felix conditioner.  The aluminum plates are temporary heatsinks until the correct ones arrive.  They do run HOT!  With +/-36v rails, the modules can easily swing +/-20 volts balanced to drive my monoblock First Watt PassDIY F4 clones to full output in Class A (finally) for my Emerald Physics CS2 woofer section.  They're set up for about 19db gain, easily matched to the 15db of my F5 for the CS2's compression driver/waveguide.  All I need now is a decent case to put them in and I'm in business.  They do play music, at least on the bench listening setup  :wink:

(http://www.audiocircle.com/image.php?id=18558)
Title: Re: What equipment have you built recently?
Post by: mgalusha on 2 Mar 2009, 04:16 am
Your bench is too neat Tom, it disturbs me. :)

Since we have moved to almost done... I've been building a custom DCX mod for a friend, his won't have the Jan Didden analog board but I'm hoping it sounds at least as good but of course without the volume control. Reworking the output stage from 4 op-amps/channel to 1 and it will be direct coupled. The input stage has been interesting, using an LM4562 for an input buffer feeding a OPA1632 diff amp. I had some TI TL431 shunt regulators on hand so I am using one of those to provide the 2.5V for the ADC biasing. I've altered the gain architecture to hopefully maximize the ADC/DAC levels to provide the best SNR and maximum bits of digital conversion.
Title: Re: What equipment have you built recently?
Post by: Glen B on 2 Mar 2009, 09:53 am
I built tube amps and speakers in the '70s and early '80s.  Now I do mostly restorations and mods of vintage equipment, and other projects.  Following are links to galleries on three of my projects.

DIY balanced AC power conditioner with surge protection:

http://img.villagephotos.com/p/2003-5/191557/1741050

Refurbished SAE 2400, upgraded input and output connectors; replaced captive power cord with IEC inlet:

http://img.villagephotos.com/p/2003-5/191557/1986567

Phase Linear 400 Series 2; added DC protection/delay circuitry, upgraded input and output connectors; upgraded power cord:

http://img.villagephotos.com/p/2003-5/191557/1927085
Title: Re: What equipment have you built recently?
Post by: BradJudy on 7 Mar 2009, 06:01 pm
Here's my latest DIY project:

(http://bradjudy.smugmug.com/photos/486139234_zjynU-M.jpg)

I have a thread on it in the Eye Fidelity circle - http://www.audiocircle.com/index.php?topic=65646.0
Title: Re: What equipment have you built recently?
Post by: mgalusha on 7 Mar 2009, 07:13 pm
I've been following your thread on the pinhole camera Brad, very cool. Quite amazing images for almost a no-tech design.
Title: Re: What equipment have you built recently?
Post by: jrebman on 9 Mar 2009, 04:05 pm
I have 3 projects in progress -- one just about done, the other I have all the parts collected but need some assistance with a very dense PC board, and in the starting to gather the cheaper parts and figure out last design details phase of the third.

They are:

1.) Complete makeover of Horn Shoppe Horns.  The Austrailian Lacewood veneer finished with catalyzed lacquer, the threaded brass inserts for the driver mounting screws, the threaded brass inserts for the spikes, and the BB fill hole drilled to fit the custom 2" aluminum cover plate are all done.  The solid copper binding posts are mounted on plates, and the Chimera Labs 7-7 OCC Litz braid internal wiring are all here and waiting to be installed.  I need to get them over to a friend's house so I can use his drill press to drill the two-step hole for the EAR Isoloss grommet for the wiring, and then the compression chamber gets lined with felt before installing the wire and drivers.  Then the last step will be to felt line parts of the Horn mouth.  I experimented with most of this stuff before deciding to go all out on the finishing, so the final results should be even better than the temporary tweaks.

The second project is a Millet Max Mini hybrid headphone amp, and all parts are in the house, including big black gate NX series output coupling and cathode bypass caps, and audio note tantalum output coupling resistors.  Pretty much everything else is stock as called for in the BOM except for a pair of Vampire RCAs and a Thingamabob for the volume knob.

And the last project, *the* big, no holds-barred amp project, will be some variation of Poindexter's Musical Machine.  Just have to decide on driver tubes and Iron, and of course come up with the money to pay for it :D.

I haven't said much in the lab lately, but I've been working on these various things for quite some time now -- mostly the Horns.

I'll post pics of the whole Horn makeover process in another thread when I'm done and they are playing.

-- Jim
Title: Re: What equipment have you built recently?
Post by: JoshK on 9 Mar 2009, 06:54 pm
I decided to sticky this thread, since its a fun thread and worth drooling over pictures of someone's creation.  The point is to make it a gallery of pictures, and possibly links to build threads.

I am also considering making a thread on "what equipment are you currently working on?"  That seems to be a popular enough sub-topic, that it deserves its own thread.
Title: Re: What equipment have you built recently?
Post by: jeffdavison on 13 Mar 2009, 05:35 pm
Here's my finished mono blocks

Driver tube is a WE437a direct coupled to a EML 320B-xls using stacked power supplies.

(http://www.audiocircle.com/image.php?id=18760)
(http://www.audiocircle.com/image.php?id=18761)
(http://www.audiocircle.com/image.php?id=18762)
(http://www.audiocircle.com/image.php?id=18763)
(http://www.audiocircle.com/image.php?id=18764)

JD
Title: Re: What equipment have you built recently?
Post by: JoshK on 13 Mar 2009, 05:37 pm
Sweet!   :thumb: 

Looks great.  How does it sound? 
Title: Re: What equipment have you built recently?
Post by: jeffdavison on 13 Mar 2009, 05:42 pm
simply...... WOW.
Title: Re: What equipment have you built recently?
Post by: JoshK on 13 Mar 2009, 06:33 pm
I'm good and jealous.  What kind of speakers are you driving?
Title: Re: What equipment have you built recently?
Post by: jeffdavison on 13 Mar 2009, 07:50 pm
Threw together some open baffle speakers using Hawthorne's Silver Iris drivers, I took liberties with my own crossovers (their schematic).


(http://www.audiocircle.com/image.php?id=18772)
(http://www.audiocircle.com/image.php?id=18770)
(http://www.audiocircle.com/image.php?id=15357[img]
[img]http://www.audiocircle.com/image.php?id=18765)
(http://www.audiocircle.com/image.php?id=14189)
(http://www.audiocircle.com/image.php?id=18768)
(http://www.audiocircle.com/image.php?id=18769)
(http://www.audiocircle.com/image.php?id=15855)

JD

Title: Re: What equipment have you built recently?
Post by: TomS on 16 Mar 2009, 03:11 am
I think I can officially say my Behringer DCX2496 digital crossover is "done" now.  If you're using one of these, especially with the Emerald Physics CS2's, you don't know what you're missing.  It simply sounds fantastic now.

Many thanks to Mike Galusha for leading the way on what works and what doesn't in this setup.  I've followed his journey and exchanged a zillion emails and instant messages with him.  Amazingly, he has been totally patient with all of my questions and tribulations.  In the home stretch last week, he even sent me a few parts from his personal stash to finish it up.  This is the kind of guy AC is all about, that is, a community.

The final mod list:
- Replace analog inputs and outputs with Linear Audio (Jan Didden) remote control analog I/O board with a few tweaks
- Remove CS8420 digital in.  Install Frank Oettle CS8416 clock/SRC replacement board (<2ps jitter).
- Replace 2 7805 regulators with 2 Oettle discrete mini-regulators (5v)
- Removed extra A/D converter not used on C input
- Replaced 3 AKM 4393 DACs with AKM 4396 DACs
- Replaced all electrolytics with Panasonic FM's, Black Gates, and Elna Silmic II's
- Installed LC filters on +/-15v lines
- Rewired and reterminated AES/XLR input to BNC SPDIF 75 ohm with coax, bypass ribbon cable and connectors
- Add external "Felix" AC mains filter

At this point there isn't much left to do.  Most likely, the weak link is the analog output section, but I'm not sure this poor DCX chassis/pcb could take any more soldering to improve it.  I think I"ll quit while I"m ahead.

My current setup is:
- Bolder SB2 - loaded, with Nirvana supply, etc.
- modded DCX2496 as above
- "Pumpkin/Shunty" balanced gain stage on LF (~19db) to provide big voltage swing to the F4's
- "Felix" built-in to preamp's remote AC/transformer box
- Balanced monoblock DIY First Watt F4 clones on LF (driven by Pumpkin)
- Single ended DIY FIrst Watt F5 clone on HF (~16db)
- Emerald Physics CS2's, bypassed binding posts on compression drivers

I'm really happy with the result and I know for sure why Mike isn't doing these conversions any more.  The boards are very fragile since they were made to be built only once by automated equipment, not hacked up by the likes of me.  It takes a lot of hours to do this right, and Mike saved me probably double that with his helpful tips (Chip Quik is the BEST!).  I now have a huge bag full of discarded parts to show for it too.

There are a lot of mod strategies for the DCX, but this combo has to be one of the best in terms of integration of the right stuff.  I really didn't believe this lowly device could sound this good, but as Zybar told me several times, indeed it does. 

Bravo Mike, Jan D, and Frank O !

Tom
Title: Re: What equipment have you built recently?
Post by: mgalusha on 16 Mar 2009, 03:45 am
Thanks for the kind words Tom, glad I could help. The Chip Quik does make it much less painful. I'm very happy to learn you have it back together and running. They do sound nice when all dressed up. :)
Title: Re: What equipment have you built recently?
Post by: JoshK on 16 Mar 2009, 02:13 pm
Sounds cool Tom.  It feels great to accomplish your own system goals doesn't it? 

What drives the SE F4?  Or did you build in a gain stage?
Title: Re: What equipment have you built recently?
Post by: TomS on 16 Mar 2009, 02:45 pm
Quote from: JoshK on 16 Mar 2009, 02:13 pm
Sounds cool Tom.  It feels great to accomplish your own system goals doesn't it? 

What drives the SE F4?  Or did you build in a gain stage?
Thanks Josh.  I feel good about having almost my entire system DIY or heavily modded commercial stuff now.  A pair of Abbeys would really top that off, but my budget can't handle it at the moment  :wink:

There are two F4's run as monoblocks in balanced mode.  The Pumpkin/Shunty preamp is set up as a fixed gain stage (20db) to drive the F4's to full output for LF from the output of the DCX.  I suppose I need to get a picture so it makes more sense.
Title: Re: What equipment have you built recently?
Post by: JoshK on 16 Mar 2009, 03:36 pm
Sorry, I misread the single ended ones are F5s, not SE F4s.  I get it now.

Title: Re: What equipment have you built recently?
Post by: Timothy Shields on 4 Jun 2009, 12:07 am
Build the Pass Labs B1 preamplifier as my first electronics project.  Was quite enjoyable despite wiring on of the pots in reverse!  The resulting preamplifier sounds much better than my Golden Tube SEP-1; cleaner, but not harsh and etched.  I am considering building some mono blocks, but need to find a source for large heat sinks (approximately four matching 5" x 11").
Title: Re: What equipment have you built recently?
Post by: face on 14 Jul 2009, 12:45 am
Tannoy HPD-385A crossover, work in progress.  My goal was to discard the original switches and autoformer. 

(http://face.cleanandquiet.com/store/HPD385A%20Crossover.jpg)

Since the picture was taken, the plastic bobbin Madisound inductor has been replaced by the appropriate Alpha Core.  Soon the boxes will be stained and polyed like the Tannoy's they belong to. 

Here's the response:

(http://face.cleanandquiet.com/store/HPD-385A%20Response.jpg)

Other than the dip at 400hz(due to cabinet resonance), the curve is much flatter than before. 
Title: Re: What equipment have you built recently?
Post by: JoshK on 14 Jul 2009, 01:12 am
For the cabinet, try an oak dowel as a cross brace.  Not too big in terms of volume and yet effective.
Title: Re: What equipment have you built recently?
Post by: BillB on 9 Aug 2009, 04:33 am
I just finished a mega-build of my preamp design. It features HYPER-FRED diodes, Panasonic power caps with Solen bypasses, a Tubecad H-PS-1 tube heater supply, PRP resistors everywhere but the grid stoppers which have vintage carbons.

It also features a cap selector on the outputs which has a Hyrel Q PIO cap bypassed by a dayton film and a pair of dayton polys in the second slot.

Input cap is Jantzen Z-superior.

It uses 6j6 tubes, just like the base version of my pre.

(http://img526.imageshack.us/img526/6521/dsc09656.jpg)

the cap selector box:
(http://img329.imageshack.us/img329/5163/dsc09652.jpg)
Title: Re: What equipment have you built recently?
Post by: jules on 9 Aug 2009, 05:44 am
Timothy,

if you can't find a local supplier Conrad heat sinks in Australia have what you want.

http://www.conradheatsinks.com/products/flat100_350.html#MF30

Conrad dimensions might seem a little odd at first sight in that they call what I'd call "length", "width" and vice versa but you can get 150mm [approx 6"] tall by 300 or 350mm [~12" and 14" respectively] sinks at reasonable prices. I'm using 4 of the latter in a Class A amp I'm building at the moment ... excellent quality! Total weight for 4 of the longer [wider  :) ?] ones is ~20lb so things can start to get heavy which could be a hazard for postage.

Jules
Title: Re: What equipment have you built recently?
Post by: Berndt on 9 Aug 2009, 06:13 am
I am really excited to hear my new turntable, see the vinyl room for more details, or I'd be happy to share here as well.
(http://www.audiocircle.com/image.php?id=21049)
Title: Re: What equipment have you built recently?
Post by: guest48077 on 9 Aug 2009, 01:50 pm
Recently finish a DIY Record Cleaning Machine. Works Very well.
I posted a thread a little while back going into detail on cost and constructions.
http://www.audiocircle.com/index.php?topic=70330.0

(http://www.audiocircle.com/image.php?id=20788)
(http://www.audiocircle.com/image.php?id=20785)
Title: Re: What equipment have you built recently?
Post by: jtwrace on 9 Aug 2009, 03:23 pm
my subs that can be seen in this thread: http://www.audiocircle.com/index.php?topic=68426.0
Title: Re: What equipment have you built recently?
Post by: BillB on 9 Aug 2009, 08:58 pm
Here is the internals:
(http://img256.imageshack.us/img256/4477/dsc09660.jpg)
Here is the stock version:
(http://img16.imageshack.us/img16/7011/dsc09326t.jpg)
Title: Re: What equipment have you built recently?
Post by: sts9fan on 31 Aug 2009, 04:15 pm
New speakers for my shop.  Foxtex single driver with a "Urban Graff" finish.  Mostly a project to work on while glue/paint dries on others. 

(http://www.audiocircle.com/image.php?id=21612)
(http://www.audiocircle.com/image.php?id=21613)



Title: Re: What equipment have you built recently?
Post by: sts9fan on 24 Sep 2009, 12:54 pm
Finished my Gedlee Nathan 10 speakers this week.  Here are a few pics of the process.
Just glued together
(http://www.audiocircle.com/image.php?id=22227)
Sealed with Shellac and screwholes frilled with dowels
(http://www.audiocircle.com/image.php?id=22228)
Screw rails added
(http://www.audiocircle.com/image.php?id=22229)
Lots of sanding and Bondo
(http://www.audiocircle.com/image.php?id=22230)
Seven coats of BINS primer
(http://www.audiocircle.com/image.php?id=22231)
Drivers installed
(http://www.audiocircle.com/image.php?id=22232)
(http://www.audiocircle.com/image.php?id=22233)
Stupid number of screws
(http://www.audiocircle.com/image.php?id=22235)
Finished back
(http://www.audiocircle.com/image.php?id=22236)
Making Magic
(http://www.audiocircle.com/image.php?id=22238)
This is the paint I used.  For the main body I used Bone White and for the back Lava Orange
(http://senseslost.com/wp-content/uploads/mtn94_2.jpg)

These things are FANTASTIC!!

Title: Re: What equipment have you built recently?
Post by: TomS on 24 Sep 2009, 02:18 pm
Those Nathans really turned out great.  You should really enjoy them!
Title: Re: What equipment have you built recently?
Post by: jrebman on 24 Sep 2009, 02:21 pm
Chris,

Congrats on finishing the Nathans!

I recently finished all the tweaks and mods to my Horn Shoppe Horns and hope to post some pics soon.  They're sounding really, really good too.

I bought the Horns with no finish, just bare wood and some tan color faux stone applied to the Horn mouth, and then did the following:

1.) Had a local audio buddy/ pro cabinetmaker veneer and lacquer all sides but the horn mouth with Aussie Lacewood with a light tint of red analine dye.

2). Re-orient the drivers to the square orientation instead of the original diamond configuration and install #8 threaded brass inserts.

3) drill flush hole for ballast fill port cover plate and then 1/2" hole in the center of that for filling BBs.

4)  replaced stock binding posts with solid, unplated copper CMC posts and rewired with a 16" length of Chimera Labs 7-7 enameled OCC Litz wire.

5) applied 1/8" industrial noise absorbtion grade felt to upper and lower horn mouths, and rear, and back 4" of compression chamber left, right, and top surfaces.

6) Applied 3/16" gore-tex gasket around driver opening, soldered Planet 10 modified FE-126s in place (with the fluffy wool pad glued on the back of the magnet), and bolted drivers in place with #8 brass button head machine screws.

7) Filled bottoms of speakers with 24,000 BBs per side, stuffed remaining empty space with wads of compressed heavy craft paper, and screwed aluminum cover plates in place.

Setup, connect speaer wires, and enjoy...

Will post pics soon as I can figure out how to shrink them.

-- Jim
Title: Re: What equipment have you built recently?
Post by: sts9fan on 24 Sep 2009, 02:24 pm
Thanks guys.  I will post a non crappy iphone pic later.
Title: Re: What equipment have you built recently?
Post by: Hebrew Hammer on 24 Sep 2009, 03:19 pm
they look great man!!!!

Quote from: sts9fan on 24 Sep 2009, 02:24 pm
Thanks guys.  I will post a non crappy iphone pic later.
Title: Re: What equipment have you built recently?
Post by: Hebrew Hammer on 24 Sep 2009, 03:21 pm
I really want to do a turntable from scratch... who's the person to talk/bother/annoy with questions   aa
Title: Re: What equipment have you built recently?
Post by: TomS on 24 Sep 2009, 03:40 pm
Quote from: Hebrew Hammer on 24 Sep 2009, 03:21 pm
I really want to do a turntable from scratch... who's the person to talk/bother/annoy with questions   aa
Given your talent for wood, you might do a search for "Teres" threads on AC and elsewhere.  Also there are some folks here doing cool things with precious old Empires and Lenco's.
Title: Re: What equipment have you built recently?
Post by: Hebrew Hammer on 24 Sep 2009, 04:11 pm
Thanks Tom... I think my old man has a Merill turntable that has been packed away for 10ish years.. I may need to experiment
Quote from: TomS on 24 Sep 2009, 03:40 pm
Quote from: Hebrew Hammer on 24 Sep 2009, 03:21 pm
I really want to do a turntable from scratch... who's the person to talk/bother/annoy with questions   aa
Given your talent for wood, you might do a search for "Teres" threads on AC and elsewhere.  Also there are some folks here doing cool things with precious old Empires and Lenco's.
Title: Re: What equipment have you built recently?
Post by: TomS on 24 Sep 2009, 04:28 pm
Quote from: Hebrew Hammer on 24 Sep 2009, 04:11 pm
Thanks Tom... I think my old man has a Merill turntable that has been packed away for 10ish years.. I may need to experiment
Quote from: TomS on 24 Sep 2009, 03:40 pm
Quote from: Hebrew Hammer on 24 Sep 2009, 03:21 pm
I really want to do a turntable from scratch... who's the person to talk/bother/annoy with questions   aa
Given your talent for wood, you might do a search for "Teres" threads on AC and elsewhere.  Also there are some folks here doing cool things with precious old Empires and Lenco's.
That is a superb platform to start with... Have fun!
Title: Re: What equipment have you built recently?
Post by: TomS on 24 Sep 2009, 04:51 pm
Quote from: TomS on 24 Sep 2009, 03:40 pm
Quote from: Hebrew Hammer on 24 Sep 2009, 03:21 pm
I really want to do a turntable from scratch... who's the person to talk/bother/annoy with questions   aa
Given your talent for wood, you might do a search for "Teres" threads on AC and elsewhere.  Also there are some folks here doing cool things with precious old Empires and Lenco's.
Oh, and I should have mentioned the Teres platters are usually slabs of wood  aa 
(http://www.teresaudio.com/images/t-265-800.jpg)
Title: Re: What equipment have you built recently?
Post by: sts9fan on 12 Nov 2009, 05:29 pm
Finished the stands for my Nathans last night.  Based them on the "Stubby" project I read here somewhere.  The top plate is three layers of birch ply and the botton is two.  I have set a min veiwing distance or 5' and they look great.
Crappy iphone pic
(http://www.audiocircle.com/image.php?id=23705)
Title: Re: What equipment have you built recently?
Post by: JoshK on 17 Jan 2010, 01:33 am
Long time in the making.  Don't look too hard, you'll find some mistakes....I did learn a great deal.  Crystalac rocks!!  Its now what I'll use for every speaker project.

(http://www.audiocircle.com/image.php?id=25534)


Title: Re: What equipment have you built recently?
Post by: TrungT on 17 Jan 2010, 01:52 am
Josh
Look awesome  :thumb:

"mistakes" where ... where
Wish I can build 1/2 that good.  :duh:
Title: Re: What equipment have you built recently?
Post by: mgalusha on 18 Jan 2010, 01:39 am
Very nice Josh, those babies should move some serious air. How do you like the sound so far?
Title: Re: What equipment have you built recently?
Post by: JoshK on 18 Jan 2010, 02:02 am
I haven't hooked them up yet.  I know it is hard to believe, but I am not all setup at the moment.  I may pull out the QSC waveguides, put the DE250's on them and rough out a xo in the 1.2khz range but that is a little high for the TD15Xs. 

I did some work on my Abbey clones today.  Getting it all sanded down for the primer coat and then I'll finish them with this pro-audio textured paint I bought that rolls on.  I am thinking of mounting a removeable back on them so I can alternate between quasi cardiod and sealed enclosure. 

I also have the MT waveguides from these, plus the drivers...
http://www.qscaudio.com/products/speakers/hpr/hpr153i.htm

Could possibly work with that, but I am not sure if I have 6 channels of amps working unless it was a hodge podge.  Maybe I could pull my reciever into action.
Title: Re: What equipment have you built recently?
Post by: Wardsweb on 22 Jan 2010, 01:18 pm
My latest 3886TF chip amp. Simplicity


(http://wardsweb.org/audio/LM3886/LM3886TF1.jpg)


(http://wardsweb.org/audio/LM3886/LM3886TF3.jpg)
Title: Re: What equipment have you built recently?
Post by: Wardsweb on 23 Jan 2010, 02:35 am
A little something for the tube crowd. A battery powered pre.


(http://wardsweb.org/audio/quickie/quickieveneer.jpg)
Title: Re: What equipment have you built recently?
Post by: satfrat on 23 Jan 2010, 02:43 am
Quote from: Wardsweb on 22 Jan 2010, 01:18 pm
My latest 3886TF chip amp. Simplicity


(http://wardsweb.org/audio/LM3886/LM3886TF1.jpg)


(http://wardsweb.org/audio/LM3886/LM3886TF3.jpg)

Any specs available on his little gem? You sure do beautiful diy work.  :notworthy:
 
Cheers,
Robin
Title: Re: What equipment have you built recently?
Post by: Wardsweb on 23 Jan 2010, 03:05 am
Quote from: satfrat on 23 Jan 2010, 02:43 am

Any specs available on his little gem? You sure do beautiful diy work.  :notworthy:
 
Cheers,
Robin

The LM3886 chip is rated at 68 watts. I'm under driving them, so get about 50 watts per chip. It does make a nice little 100 watt amp. Plenty of guts to drive even non-efficient speakers and has a nice crisp high end.

Title: Re: What equipment have you built recently?
Post by: face on 23 Jan 2010, 04:54 am
Quote from: Wardsweb on 23 Jan 2010, 02:35 am
A little something for the tube crowd. A battery powered pre.


(http://wardsweb.org/audio/quickie/quickieveneer.jpg)
Very nice!
Title: Re: What equipment have you built recently?
Post by: Wardsweb on 23 Jan 2010, 05:37 am
Quote from: face on 23 Jan 2010, 04:54 am
Very nice!
Thanks - the cabinet is Brazillian rosewood. The chassis is acrylic. I will be building a larger versioin of the cabinet to mount my new EL34 amp I'm building.
Title: Bandpass subs (veneered sonotubes) and class D amp
Post by: DougSmith on 27 Jan 2010, 02:01 pm
I recently finished building these 4th order bandpass subs, which I designed to complement my Geddes Abbeys.

(http://www.dougsmith.lisalandy.com/myalbum/subs.jpg)

The port opening is at the top end, covered by grill cloth. There is a ¼” layer of cork between the sonotube (14” diameter) and veneer to smooth out the surface and to add some extra dampening. The drivers are B&C 12TBX100s (same as the Abbey woofers) and are mounted vertically with a 4” port and a fairly small front chamber.  Here is a picture of the baffle and port assembly:

(http://www.dougsmith.lisalandy.com/myalbum/baffle.jpg)

I am using a DCX 2496 and external amps to drive them. I built the amps as well using two 2 x 250W modules from Class D Audio.

(http://www.dougsmith.lisalandy.com/myalbum/IMGP3906.jpg)

They sound great… providing a subtle (but deep) foundation for music – but also capable of room-shaking response on movies or bass-heavy music. I have two (bridgeable) channels left on the amp for a third sub, but I haven’t decided what to do for that one yet.

- Doug
Title: Re: What equipment have you built recently?
Post by: JoshK on 27 Jan 2010, 02:09 pm
Nicely done!  Love the veneer too, is that a mahogany veneer?
Title: Re: What equipment have you built recently?
Post by: TomS on 27 Jan 2010, 02:19 pm
Doug,

Those look great!  Since those are bandpass can you comment on the tuning in terms of cutoffs and output?

Tom
Title: Bandpass subs (veneered sonotubes) and class D amp
Post by: DougSmith on 27 Jan 2010, 02:57 pm
Yes, it's mahogany.

Here is what the response looks like in-room from just the subs. It is averaged across the main listening position; one sub front between the mains and one in the back to the side of the listening position. I also added several narrow bands of EQ to knock down the peaks in the response - the stuff at around 300 hz is ambient noise form my heating system, not port resonance (it was still there with the subs turned off):

(http://www.dougsmith.lisalandy.com/myalbum/inroomeq.jpg)

and here they are with the Abbeys...  EDIT: I ended up with the following after a bit more optimization work (including phase adjustment, adding a few more PEQ filters in the DCX for the subs, plus a few in my receiver as well for the mains in the 80-200 Hz region; 0.05 octave smoothing). Looks like I can probably get away without a third sub.

(http://www.dougsmith.lisalandy.com/myalbum/broadband response av 5 positions on couch.jpg)
Title: Re: What equipment have you built recently?
Post by: sts9fan on 2 Feb 2010, 12:06 am
Here is some pics of my Pearl/Xono phono stage


(http://lh3.ggpht.com/_2BCe0eSjHpI/S2drXiode7I/AAAAAAAAAOA/pmuBDoDAZhA/s400/Pearl%20PS.JPG)

(http://lh4.ggpht.com/_2BCe0eSjHpI/S2drckluzFI/AAAAAAAAAOI/LiBhWwBOKI8/s400/IMG_2308.JPG)


(http://lh3.ggpht.com/_2BCe0eSjHpI/S2drhYFCCDI/AAAAAAAAAOQ/78h-dc83eCQ/s400/new%20Pearl.JPG)

Title: Re: What equipment have you built recently?
Post by: Charles Calkins on 2 Feb 2010, 01:06 am
NADA!!!
  Leave it to me and for sure I'd screw something up!! Then it would be into the GARBAGE can. I'll stick with buy it plug it in and enjoy!!

                                          Cheers
                                          Charlie
Title: Re: What equipment have you built recently?
Post by: Stuart Cohen on 6 Feb 2010, 02:47 am
Another LM3886 chip amp; mono-blocks. I'm listening to James Taylor Hourglass on SACD as I submit this post. Simple....... yes, but they sound amazing.


(http://www.audiocircle.com/image.php?id=26370)

(http://www.audiocircle.com/image.php?id=26368)
Title: Re: What equipment have you built recently?
Post by: Caucasian Blackplate on 18 Feb 2010, 08:24 pm
Here is a recent phono preamp I did for a friend/customer. 

(http://usr.audioasylum.com/images/2/27873/DSC_0061.JPG)
(http://usr.audioasylum.com/images/2/27873/DSC_0057.JPG)
(http://usr.audioasylum.com/images/2/27873/DSC_0060.JPG)
Title: Re: What equipment have you built recently?
Post by: sts9fan on 18 Feb 2010, 08:41 pm
very cool.  Can you tell us about it?
Title: Re: What equipment have you built recently?
Post by: eparson on 14 Mar 2010, 04:57 pm
Here is my Aikido preamp.  It is uses 12AU7 tubes, Antek torrodial transformer and is built on John Broskie's all in one pcb.  The case is aluminum and blood wood, with Knobs by Scott and Thingaknobs. 


(http://www.audiocircle.com/image.php?id=27760)

(http://www.audiocircle.com/image.php?id=27761)

(http://www.audiocircle.com/image.php?id=27762)
Title: Re: What equipment have you built recently?
Post by: gvimhoof on 2 Jun 2010, 12:51 am
Very nice, eparson.  Very nice indeed.  Woof!
Title: Re: What equipment have you built recently?
Post by: Berndt on 2 Jun 2010, 03:49 am
(http://www.audiocircle.com/image.php?id=31085)

(http://www.audiocircle.com/image.php?id=31086)






The Truce TT was an evolution of Peters desire to build a cheapo tt,
and my compulsive mass sentiment.
http://www.diyhifisupply.com/node/452
http://www.diyhifisupply.com/node/652
brg and platter
http://cgi.ebay.com/Timaudio-DIY-Separate-Motor-for-Turntable-Belt_W0QQitemZ400106218398QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item5d2830639e
Not really partial to the inverted bearing design as it makes the oil
resevoir nearly impossible, and due to the fact that this particular
brg has tightish clearances running grease as is usually required in
an inverted design was not desireable, (IMHO).
Not visable in the picture is a center hub that incorporates a
resessed well that acts as an oil resevoir.
There is a layer of reinforced rubber between the hub and the 1.5"
base plinth. The cutting block is sandwiched between the bearing hub
and the plinth, nodding my hat towards constrained layer damping. The
arm mount which was intended to have the set screws mounted in the
back for cosmetic reasons mounts the rb300 style threaded stub on a
length of material that is fitted closely to the hub to allow arm
removal and addition height offset for the uk audio mods arm.
Watching Peter work on TT's has allowed me to tailor this particular
design to make it easier for him to service and adjust the arm without
having to acces the bottom of the deck.
Peter originally wanted to mount an armboard on the butcher block as
well as add spikes to the base. I felt compelled to over do it.
Number wise I believe this one is the fifth construction.
I also like the idea of adding mass to the end of the moment arm, that
being the arm mount at the end of the plinth. Adding mass to that
point reduces the resonant frequency. In my own experience this quiets
the feedback loop/hum that occurs at louder volume levels. This is
also the first forray into a non-empire motor driven deck, breaking
the reliance on parts that are rapidly gaining in price. I am very
grateful to Peter for the experience I have had building tt's. It has
been quite rewarding and I wouldn't have been able to perservere
without his confidence, approval, and generosity.
Best rgards,Bill
Title: Re: What equipment have you built recently?
Post by: Berndt on 2 Jun 2010, 03:52 am
Also, Peter used a tt weights copper record matt as well as the UK audiomods rb-250 w/ vta adjustability.
This one is #6, btw.
Working on #7...
Title: Re: What equipment have you built recently?
Post by: mgalusha on 2 Jun 2010, 12:54 pm
Sweet! I'm sure it sounds as great as it looks.
Title: Re: What equipment have you built recently?
Post by: ebag4 on 2 Jun 2010, 02:01 pm
I have just finished a pair of GR Research V-1s, here is a link to the build thread for those that are interested:
http://www.audiocircle.com/index.php?topic=79985.0

For the rest, here are a few pics!

(http://www.audiocircle.com/image.php?id=30874)

(http://www.audiocircle.com/image.php?id=30881)

(http://www.audiocircle.com/image.php?id=30882)

(http://www.audiocircle.com/image.php?id=31000)

(http://www.audiocircle.com/image.php?id=31038)

(http://www.audiocircle.com/image.php?id=31039)

(http://www.audiocircle.com/image.php?id=31095)

(http://www.audiocircle.com/image.php?id=31096)

(http://www.audiocircle.com/image.php?id=31097)

(http://www.audiocircle.com/image.php?id=31098)


Best,
Ed
Title: Re: What equipment have you built recently?
Post by: macrojack on 2 Jun 2010, 02:16 pm
Ed - I'm sure your speakers sound great but really, who cares. They are such beautiful craftsmanship and have such an alluring art deco mystique, they earn their place on looks alone. They kinda look like penguins.
Title: Re: What equipment have you built recently?
Post by: ebag4 on 2 Jun 2010, 02:46 pm
Quote from: macrojack on  2 Jun 2010, 02:16 pm
Ed - I'm sure your speakers sound great but really, who cares. They are such beautiful craftsmanship and have such an alluring art deco mystique, they earn their place on looks alone. They kinda look like penguins.

Thanks MJ.  You are correct in assuming they sound great, they really do, I will review them after I have had more time but for now I have this stupid grin across my face when I listen to them.

I wasnt really going for the penguin look but you are not the first to mention the similarity.  The art decco look is something that I had in mind, at least subconsciously.  If I had completed the top ornament for the grill there would be no mistake, it would look even more art decco-ish  :wink:.  After four failed attempts to make the grill addition I decided to set it aside (part is too small and I value my fingers!).

Best,
Ed
Title: Re: What equipment have you built recently?
Post by: jules on 2 Jun 2010, 09:51 pm
Magnificent Ed ... love the feet!!

Berndt;

That's a great looking tt for a very reasonable outlay. Not sure if it's intended but I imagine the copper would quickly remove static from records too.

A question about lubricant. You mention oil or grease for the centre hub  reservoir. What specific type of oil would you use in this situation? There's some interesting possibilities in synthetic/teflon oil that could be well suited to a job like this.

jules 
Title: Re: What equipment have you built recently?
Post by: Berndt on 3 Jun 2010, 12:19 am
witht the tighter clearances of this bearing I am using mobil1 atf.
The hub that the bearing sits in has a resevoir detail so the oil can be contained, normaly not an option with an inverted design.


(http://www.audiocircle.com/image.php?id=31120)
Title: Re: What equipment have you built recently?
Post by: jules on 3 Jun 2010, 09:35 am
Thanks for the detail photo.

mobil automatic transmission fluid eh? Clearly you've put some thought into it.

I'm wondering if lubricants intended for watches and clocks might be useful in various parts of tts. Moebius make a series of lubricants ranging from light oil [used in watches for the fast moving balance whee] right through to a grease designed for heavier shafts and slow moving parts [eg the shaft for the barrel holding the spring for a watch or clock]. These are specifically designed to last for maybe 5 years between servicing [unlike older oils]. Moebius costs a packet for very small amounts but there's other options like Dupont, teflon synthetic.

Even if it would not be useful for the bearing we're talking about here, there's a heap of places on a tt that need lubrication and maybe something better than the stuff we use on sewing machines.

Hmm, maybe I should post this in the vinyl circle?

jules
Title: Re: What equipment have you built recently?
Post by: jtwrace on 3 Jun 2010, 11:46 am
I've always thought a low friction coating like I use on many components would work great on s TT spindle.  Hmm.  Now if I only had a TT worth doing it on.   :(  I knew I never should've sold it...
Title: Re: What equipment have you built recently?
Post by: Berndt on 3 Jun 2010, 01:28 pm
The lubricant viscosity makes an audible effect. The clearances in the empires I started out on didn't sound very coherent with lighter weight lubricant, actualy ended up using teflon grease, from the bicycle days. Mobil 1 atf is what Thom Makris of Galibier TT's suggests using.
Perhaps a new thread is in order, so we can stop the hyjack. Also the thrust bearing material makes a difference as well.
Title: Re: What equipment have you built recently?
Post by: shedman on 12 Jun 2010, 10:24 am
Pete Millett s Low Mu Pre Amp .Just finished worked with out any problems .Dead quiet no hum
(http://www.audiocircle.com/image.php?id=31496)
 
Title: Re: What equipment have you built recently?
Post by: mgalusha on 12 Jun 2010, 10:14 pm
Quote from: shedman on 12 Jun 2010, 10:24 am
Pete Millett s Low Mu Pre Amp .Just finished worked with out any problems .Dead quiet no hum
(http://www.audiocircle.com/image.php?id=31496)

Very nice. I've always wondered how that would sound. Any other thoughts on the sound other than dead quiet, which is of course a great starting point. :)

I noticed you used two 6AS7G's, did you parallel the sections? If so, did you increase the standing current?

mike
Title: Re: What equipment have you built recently?
Post by: simoon on 21 Jun 2010, 10:13 pm
Quote from: Berndt on  2 Jun 2010, 03:49 am


http://cgi.ebay.com/Timaudio-DIY-Separate-Motor-for-Turntable-Belt_W0QQitemZ400106218398QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item5d2830639e


What do you think of that Chinese motor?

I was thinking about ordering one myself for a TT mod project I have in the works.

Thanks

Dave
Title: Re: What equipment have you built recently?
Post by: simoon on 21 Jun 2010, 10:37 pm
Not too much of a project, but I needed something to get my DIY chops up, since it's been so long since I've built anything.

I modded the PC-19 driver boards in a Hafler DH 500 using these simple kits;

http://cgi.ebay.com/Hafler-DH-500-PC-19-Power-Amplifier-Upgrade-Kit-/260618432185?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item3cae11aeb9 (http://cgi.ebay.com/Hafler-DH-500-PC-19-Power-Amplifier-Upgrade-Kit-/260618432185?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item3cae11aeb9)

It's really just a cap replacement with higher end caps and a slight mod. Then I set the bias and DC offset.

Also upgraded the PS caps to Nippon Chemi-Con 22,000uF. Upgraded some wiring to shielded, upgraded the binding posts and RCAs.

A couple of evenings is all it took. Probably barely worth a mention for the experts here.

But the results were impressive. Wider sound stage, the highs were sweeter, the bass tighter. Even my non-audiophile (musician) girlfriend was able to hear the difference.
Title: Re: What equipment have you built recently?
Post by: Berndt on 22 Jun 2010, 12:34 am
good buddy has an original teres project tt.
did an aluminum platter 3" thick...
(http://www.audiocircle.com/image.php?id=31906)

(http://www.audiocircle.com/image.php?id=31907)

(http://www.audiocircle.com/image.php?id=31908)
 going to build a new aluminum plinth and a zinc armboard for the sme.
Will post again when that is done.
Title: Re: What equipment have you built recently?
Post by: Berndt on 22 Jun 2010, 12:35 am
Quote from: simoon on 21 Jun 2010, 10:13 pm
What do you think of that Chinese motor?

I was thinking about ordering one myself for a TT mod project I have in the works.

Thanks

Dave

first one smoked and was replaced. the case alone is worth their asking price, not fond of their oring belt or pully, needed to tweak the voltage to get enough speed adjustment
Title: Re: What equipment have you built recently?
Post by: simoon on 22 Jun 2010, 01:13 am
Quote from: Berndt on 22 Jun 2010, 12:35 am
first one smoked and was replaced. the case alone is worth their asking price, not fond of their oring belt or pully, needed to tweak the voltage to get enough speed adjustment

Yeah, I've heard the belt is too elastic.

What's wrong with the pulley?
Title: Re: Bandpass subs (veneered sonotubes) and class D amp
Post by: Feanor on 4 Oct 2010, 05:48 pm
Quote from: DougSmith on 27 Jan 2010, 02:01 pm
I recently finished building these 4th order bandpass subs, which I designed to complement my Geddes Abbeys.

(http://www.dougsmith.lisalandy.com/myalbum/subs.jpg)
...
- Doug

I just noticed this. Damn!  That carpet under the subs is exactly the same as the one we've got; not so easy to tell but nevertheless ...

(http://www.ody.ca/~wbailey/Stereo-Livingroom-200905.jpg)
Title: Re: What equipment have you built recently?
Post by: sts9fan on 15 Nov 2010, 03:22 pm
I just finished a pair of Solo103 speakers from HumbleHiFi.  They use the Fostex FE103en driver in place of the FE103e because I could not get the older model.  Of course they do not play super low but I am using them with a GR servo sub so no issue there. I think they sound very nice and smooth.  I used 3/4" blatic birch for the cabs.  Here are a few pics.  I am in the process of building some stands for them out of 1.5" square steel tubing. 
http://www.humblehomemadehifi.com/Solo103.html


(http://lh6.ggpht.com/_2BCe0eSjHpI/TN635fe6xWI/AAAAAAAAAkU/iHmOwNHr01M/s640/P1000637.JPG)

(http://lh5.ggpht.com/_2BCe0eSjHpI/TN63RG0mJUI/AAAAAAAAAjY/Ue_c03z_QqA/s640/P1000585.JPG)

(http://lh5.ggpht.com/_2BCe0eSjHpI/TN64C6wfoKI/AAAAAAAAAkg/tAZ97KwT9JA/s640/P1000639.JPG)
 
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 15 Nov 2010, 03:26 pm
Wow!  A sweet weekend project. Would be great for my computer setup. Thanks for the info and insight!

Anand.
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 25 Nov 2010, 06:26 am
Poseidon's Voice Rohan

Class D amplifier design utilizing Class D Audio's SDS254 board, Peter Daniel PS boards w/Mundorf E-lytics, Paul Kaplan's IEC Felix filter, and Antek 400VA toroidal transformer.

(http://www.audiocircle.com/image.php?id=39088)

(http://www.audiocircle.com/image.php?id=39089)

(http://www.audiocircle.com/image.php?id=39499)

(http://www.audiocircle.com/image.php?id=39493)

(http://www.audiocircle.com/image.php?id=39090)

(http://www.audiocircle.com/image.php?id=39495)

(http://www.audiocircle.com/image.php?id=39496)

(http://www.audiocircle.com/image.php?id=39497)


Questions/criticisms welcome.

Enjoy,

Anand.
Title: Re: What equipment have you built recently?
Post by: TrungT on 25 Nov 2010, 07:17 am
CDA 254
1000VA toroidal transformer
2 X 68,000 uf caps
Soft start

(http://www.audiocircle.com/image.php?id=39093)

(http://www.audiocircle.com/image.php?id=39094)


Title: Re: What equipment have you built recently?
Post by: DougSmith on 25 Nov 2010, 02:42 pm
Quote from: poseidonsvoice on 25 Nov 2010, 06:26 am
Poseidon's Voice Rohan

Class D amplifier design utilizing Class D Audio's SDS254 board, Peter Daniel PS boards w/Mundorf E-lytics, Paul Kaplan's IEC Felix filter, and Antek 400VA toroidal transformer....

Looks good Anand. How does it sound?
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 25 Nov 2010, 03:49 pm
Quote from: DougSmith on 25 Nov 2010, 02:42 pm
Looks good Anand. How does it sound?

My review will come soon enough probably in the Critics section of the forum.

Anand.
Title: Re: What equipment have you built recently?
Post by: jtwrace on 25 Nov 2010, 06:15 pm
Nice jop Anand.   :thumb:

Are those the new caps?
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 26 Nov 2010, 01:35 pm
Quote from: jtwrace on 25 Nov 2010, 06:15 pm
Nice jop Anand.   :thumb:

Are those the new caps?

Yup Mundorf electrolytics.

Anand.
Title: Re: What equipment have you built recently?
Post by: DougSmith on 26 Nov 2010, 02:05 pm
What voltage does the PS provide?
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 26 Nov 2010, 04:17 pm
I measured 44.9 to 45 V DC. Recommended DC voltage for the SDS 254 I recall was between 40-50 V DC per Tom. The rectifiers themselves are On Semi MUR3060 types (http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=MUR3060WTGOS-ND) (Hexfred) and are rated for 15A each! They are a 3pin TO-247 type. I bought them in bulk last year so I got a great price.

(http://media.digikey.com/photos/On%20Semi%20Photos/488-TO-247.jpg)

Anand.
Title: Re: What equipment have you built recently?
Post by: planet10 on 27 Nov 2010, 07:54 am
Classic Golden Ratio Mar-Ken12 with Mark Audio based Alpair12eN.

(http://homepage.mac.com/tlinespeakers/FAL/images/ClassicGR-Mar-Ken12.jpg)

dave
Title: Re: What equipment have you built recently?
Post by: Guy 13 on 27 Nov 2010, 10:44 am
Quote from: planet10 on 27 Nov 2010, 07:54 am
Classic Golden Ratio Mar-Ken12 with Mark Audio based Alpair12eN.

(http://homepage.mac.com/tlinespeakers/FAL/images/ClassicGR-Mar-Ken12.jpg)

dave
Hi Dave.
Those yellow/green half spheres that we see on your picture, are those tennis balls cut in half and use as dampers?
Guy 13
Title: Re: What equipment have you built recently?
Post by: TrungT on 28 Nov 2010, 07:31 am
Just finished Dodd Buffer  :thumb:

(http://www.audiocircle.com/image.php?id=39085)

(http://www.audiocircle.com/image.php?id=39110)

More detail here:
http://www.audiocircle.com/index.php?topic=79766.600
Title: Re: What equipment have you built recently?
Post by: sts9fan on 27 Dec 2010, 03:46 pm
Just finished a pair of double mouth horns.
http://www.audiocircle.com/index.php?topic=89599.new#new
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 5 Jan 2011, 04:38 am
Poseidon's Voice Sabre 32S digital analog converter - fully differential outputs.

(http://www.audiocircle.com/image.php?id=40913)

The front panel is black anodized and comes with the enclosure - from DIY Hifi Supply (http://www.diyhifisupply.com/), it was fully engraved and infilled using Front Panel Express software. The graphics of the Twisted Pear and Buffalo were imported into Corel Draw, modified for increased resolution and then exported to FPE.


(http://www.audiocircle.com/image.php?id=40914)

This is the rear panel. Pretty self explanatory. IEC is a Furutech. Switch is from Radio Shack. Vampire RCA posts and Neutrik XLR's. Digital input is WBT RCA/75 ohms. The rear isn't engraved because it is a painted black aluminum, not anodized in other words.


(http://www.audiocircle.com/image.php?id=40907)

Inside full view. Pretty classical layout. Keep AC components on one side and DC on other. You will see that a good 75% of this enclosure is occupied with power supply components.


(http://www.audiocircle.com/image.php?id=40908)

Felix IEC filter as detailed elsewhere on this site. It's now a permanent part of my builds.

(http://www.audiocircle.com/image.php?id=40909)

Hammond dual bobbin/split bobbin transformers, eliminates the need for an electrostatic shield between the primary and secondaries. Also provides for some high frequency filtering from the AC line. One 1A transformer for each of the three supplies (digital, positive analog, negative analog). Each transformer is carefully placed 90 degrees to the other to minimize hum. All AC wiring is twisted.


(http://www.audiocircle.com/image.php?id=40910)

These are the 3 Peter Daniel CRC supplies. Each capacitor is a 15,000 uf Mundorf electrolytic. The diodes are MUR 3060 three pin, hexfred technology.


(http://www.audiocircle.com/image.php?id=40911)

Paul Hynes shunt regulators. One for each supply. Ensures nearly complete isolation. I could've gone further and designed in separate analog supplies for each phase/channel! No space though.


(http://www.audiocircle.com/image.php?id=40912)

The Twisted Pear Buffalo 32S board. Has its own onboard IVY II analog output board with relays so you don't hear a 'pop' from your speakers when you turn the dac off. The output voltage is set at 2V rms (balanced output) by Shinkoh Tantalum resistors. Matched to 1%. The unbalanced/RCA output is 1V rms.

Descriptions/details to follow.

Questions/Criticisms welcome.

Anand.
Title: Re: What equipment have you built recently?
Post by: jtsnead on 5 Jan 2011, 04:57 am
NICE! Can I Have One!
Title: Re: What equipment have you built recently?
Post by: jtwrace on 5 Jan 2011, 04:59 pm
Quote from: jtsnead on  5 Jan 2011, 04:57 am
NICE! Can I Have One!

It also sounds good too!  I'm hoping he does a tube output version sometime. 
Title: Re: What equipment have you built recently?
Post by: dwr on 5 Jan 2011, 05:04 pm
Wow is all I can say, very very impressive.

Dan
Title: Re: What equipment have you built recently?
Post by: rklein on 5 Jan 2011, 05:26 pm
Anand:

Wow!  :o

Very nice build 8).  I have wanted for the longest time now to build a Buffalo DAC complete with the PH regs.  But with work and family commitments, I finally just went out and bought an EE DAC.  I'm sure your Buffalo sounds wonderful.

Congrats,

Randy
Title: Re: What equipment have you built recently?
Post by: TrungT on 9 Jan 2011, 05:49 am
Borbely headphone amp. Sound awesome  :thumb:


(http://www.audiocircle.com/image.php?id=41141)

(http://www.audiocircle.com/image.php?id=41138)

(http://www.audiocircle.com/image.php?id=41139)


(http://www.audiocircle.com/image.php?id=41140)

Title: Re: What equipment have you built recently?
Post by: TomS on 9 Jan 2011, 12:07 pm
TrungT, Very nice!  Just wondering where did you source that enclosure?  Tom
Title: Re: What equipment have you built recently?
Post by: mgalusha on 9 Jan 2011, 01:30 pm
Quote from: TomS on  9 Jan 2011, 12:07 pm
TrungT, Very nice!  Just wondering where did you source that enclosure?  Tom

+1 to both. Very nice and clean.
Title: Re: What equipment have you built recently?
Post by: TrungT on 9 Jan 2011, 02:12 pm
^^^^^
Thank You.
I got the box from Dave Pi Group, We're going to use the chassis for DIY Dac, but did not happen, Dave may let us know where he get the chassis.
I got few chassis from Circuitspecialist, it work out great too.

http://www.circuitspecialists.com/level.itml/icOid/8 (http://www.circuitspecialists.com/level.itml/icOid/8)

Title: Re: What equipment have you built recently?
Post by: sl_1800 on 14 Jan 2011, 09:38 pm
Trung you did a fantastic job on that headphone amp, very very nice.
Title: Re: What equipment have you built recently?
Post by: sl_1800 on 21 Jan 2011, 03:35 pm
My latest project can be seen on Cheep and Cheerful.
http://www.audiocircle.com/index.php?topic=79766.msg894174#msg894174 (http://www.audiocircle.com/index.php?topic=79766.msg894174#msg894174)
Title: Re: What equipment have you built recently?
Post by: shooter on 19 Mar 2011, 04:34 am
My latest speakers can be seen here, I am done with speakers, can't  imagine building anything else sounds or looks better than these.
Next project will probably be LCR phono pre.

http://www.audiocircle.com/index.php?topic=92515.0
Title: Re: What equipment have you built recently?
Post by: TrungT on 19 Mar 2011, 04:44 am
^^^^^
Very nice.
I may have to find my way there to check it out.  :thumb:
Title: Re: What equipment have you built recently?
Post by: shooter on 20 Mar 2011, 12:44 am
Thanks TrungT, you are welcome for a listen, do you live close to Dallas?
Title: Re: What equipment have you built recently?
Post by: TrungT on 20 Mar 2011, 12:59 am
Shooter
Check your PM  :D
Please give me a buzz, we can chit chat  :wink:
Title: Re: What equipment have you built recently?
Post by: Berndt on 18 Jul 2011, 07:07 pm
Just built a new amp stand for a new amp. Got the idea just listening to this amp, it told me what the stand should look like. Now when it comes back from a recap I can post the picture of them together.
Until then, here is the stand.

(http://www.audiocircle.com/image.php?id=48972)
   

Oh, Fwiw, the amp is a Krell Ksa-150
Title: Re: What equipment have you built recently?
Post by: mgalusha on 18 Jul 2011, 07:57 pm
That is very cool. Looks like something from Starship Troopers. :)
Title: Re: What equipment have you built recently?
Post by: TrungT on 21 Jul 2011, 09:18 pm
Warpspeed :thumb:

(http://www.audiocircle.com/image.php?id=49057)

(http://www.audiocircle.com/image.php?id=49058)
Title: Re: What equipment have you built recently?
Post by: TrungT on 21 Jul 2011, 10:53 pm
In-line Dodd buffer  :thumb:

(http://www.audiocircle.com/image.php?id=49062)

(http://www.audiocircle.com/image.php?id=49063)
Title: Re: What equipment have you built recently?
Post by: praedet on 22 Jul 2011, 12:08 am
^^^Very cool!!!!
Title: Re: What equipment have you built recently?
Post by: neekomax on 7 Aug 2011, 05:34 am
Check out the custom a/v rack that my girlfriend and I built for my system. I looked forever for the right size and capacity rack on the net, and basically couldn't find anything that I thought actually looked cool and wasn't $800+. So for $120 in parts (good 1"x17"x44" pine board, brackets, paint), we had a blast designing and building this one :D:

(http://www.audiocircle.com/image.php?id=49655)

(http://www.audiocircle.com/image.php?id=49656)

 
Title: Re: What equipment have you built recently?
Post by: Chris Adams on 4 Sep 2011, 10:33 pm
Hifimediy T3 mono blocks with Connexelectronic SMPS500Rs.


(http://www.audiocircle.com/image.php?id=50889)

(http://www.audiocircle.com/image.php?id=50890)

(http://www.audiocircle.com/image.php?id=50891)
Title: Re: What equipment have you built recently?
Post by: TrungT on 4 Sep 2011, 10:41 pm
^^^^^
Very nice, clean layout. :thumb:
How's sound?
Title: Re: What equipment have you built recently?
Post by: Chris Adams on 4 Sep 2011, 10:48 pm
Thanks. Sounds very coherent top to bottom. Open, well defined and spacious.
They kick some serious butt. :thumb:
Title: Re: What equipment have you built recently?
Post by: Chris Adams on 4 Sep 2011, 11:04 pm
By the way TrungT, nice looking buffer. :D
Title: Re: What equipment have you built recently?
Post by: TrungT on 4 Sep 2011, 11:28 pm
^^^^^
Thanks
 :D
Title: Re: What equipment have you built recently?
Post by: Warpspeed CE on 21 Sep 2011, 03:25 am
This unit is a keeper! It is still under evaluation/listening tests but very,
very promising indeed...

(http://www.audiocircle.com/image.php?id=51530)

For passive bi-amping with separate high and mid/low level controls, and a master volume control. This takes advantage of the loudspeaker designer's optimized crossover/driver combination...a chance to appreciate his art.
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 30 Jun 2012, 03:48 am
In order to complement my rigged Mac Mini 2009 I built a custom linear power supply that puts out ~ 18V DC.

Ingredients are as follows:



(http://www.audiocircle.com/image.php?id=64497)


(http://www.audiocircle.com/image.php?id=64496)


(http://www.audiocircle.com/image.php?id=64495)


(http://www.audiocircle.com/image.php?id=64493)


(http://www.audiocircle.com/image.php?id=64492)


(http://www.audiocircle.com/image.php?id=64491)


(http://www.audiocircle.com/image.php?id=64490)


(http://www.audiocircle.com/image.php?id=64484)


(http://www.audiocircle.com/image.php?id=64483)


(http://www.audiocircle.com/image.php?id=64482)


(http://www.audiocircle.com/image.php?id=64480)



A couple of points. For the DC connector cable, I designated Pin 4 as my Hot/+18V/Red wire; Pin 2 as my Sensor/Grey wire; and Pin 1 as my Ground/Black wire. In addition, you will see how I connected the 0.1uf/100V capacitor to the shield of the Neutrik jack and to Ground/Pin 1. This 4 pin Neutrik was used as a matter of convenience. There is more space when you have 4 pins around, even though one pin is left unused (Pin 3 in this case).

I tried this power supply with and without the Bybee MR installed. Using the Paul Hynes series regulator & supply it offers excellent performance as you would expect as an upgrade from the stock Apple switcher supply which wasn't designed for audio (compared to some other finely designed switchers in the audio industry - all of them at this point come from a small company in the Netherlands!). However, the Bybee MR to my ears, does improve the performance but slightly. You wouldn't miss it in most systems. Since I decided to use the Bybee MR, I had to account for the 2V DC voltage drop, and as such used a toroidal transformer with 20V secondaries instead of 18V secondaries. The Paul Hynes unit has an onboard potentiometer for fine tuning of the output voltage. The Nichicon Gold Tune Super Through capacitors were recommended to me by Peter Daniel who found it was a close second in sonics to Jensen's famed 4 pole electrolytics. I could not implement the 4 poles in this design as I would've had to hack into Paul Hynes' excellent board which I didn't want to do. Make sure you design for adequate heatsinking and heat sink compound. I used a 3/4 inch thick (20mm) piece of aluminum that was 6 inches by 5 inches (152 mm by 127 mm) in addition to the chassis itself. It runs warm but not uncomfortably warm.

The unit measures at 17.99V without a load and about 17.96V with the Mac Mini & 1 external firewired hard drive. With the load on, I measure absolutely no AC perturbations on the output. In addition, the unit is silent as a mouse, no buzz at all with my ear on the chassis.

Let me know if you have other questions.

Best of luck in your builds :thumb:,

Anand.

Special thanks to jtwrace, Wayne of Bolder Cables, and Paul Hynes.
Title: Re: What equipment have you built recently?
Post by: planet10 on 30 Jun 2012, 05:35 am
Rhanx for bringing this thread back poseidon

(http://p10hifi.net/FAL/images/uFonkenSET-cedarFR-800.jpg)

µFonkenSET in solid Western Red Cedar (SET = special edition trapezoid), and these little puppies are certainly special.

dave
Title: Re: What equipment have you built recently?
Post by: Paul Hynes on 30 Jun 2012, 09:38 am

Nice build as usual, Annan.

Interesting that you found a small improvement using the Bybee. The PR3 is pretty quiet but perhaps additional noise reduction is still worthwhile. Of course there may be other reasons that you heard an improvement but one can only speculate, as it is a sealed unit. A good result overall.

Regards
Paul
Title: Re: What equipment have you built recently?
Post by: TomS on 30 Jun 2012, 12:06 pm
Lovely work Anand, with the usual meticulous attention to every detail  :thumb:
Title: Re: What equipment have you built recently?
Post by: richidoo on 30 Jun 2012, 01:10 pm
Handsome power supply Anand!

Love the speakers Dave!! My wife says "they're beautiful..."
Title: Re: What equipment have you built recently?
Post by: mjock3 on 30 Jun 2012, 01:54 pm
Very nice Anand! :thumb: Thanks for sharing the particulars of the piece also. Much appreciated.
Title: Re: What equipment have you built recently?
Post by: Occam on 30 Jun 2012, 04:16 pm
Anand,

Very nice build!
Kudos on your choice of a toroidal transformer with with a shield between primary and secondary. It makes for an effective shunt to ground for line noise which without shield would capacitively couple from primary to secondary.

Regards,
Paul
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 30 Jun 2012, 04:41 pm
Quote from: Occam on 30 Jun 2012, 04:16 pm
Anand,

Very nice build!
Kudos on your choice of a toroidal transformer with with a shield between primary and secondary. It makes for an effective shunt to ground for line noise which without shield would capacitively couple from primary to secondary.

Regards,
Paul

I really wanted to do EI core, but at these sizes (200+ VA), they hum and buzz. So the next best choice was a toroid with electrostatic shielding, magnetic shielding and a steel cover. Well worth the money.

Anand.
Title: Re: What equipment have you built recently?
Post by: planet10 on 30 Jun 2012, 08:54 pm
Quote from: richidoo on 30 Jun 2012, 01:10 pm
Love the speakers Dave!! My wife says "they're beautiful..."

And the picture doesn't really give much idea of the size (that is a 3" driver)

dave
Title: Re: What equipment have you built recently?
Post by: jtwrace on 30 Jun 2012, 09:08 pm
Quote from: poseidonsvoice on 30 Jun 2012, 04:41 pm
I really wanted to do EI core, but at these sizes (200+ VA), they hum and buzz.
Anand.
Like mine.   :(
Title: Re: What equipment have you built recently?
Post by: sts9fan on 1 Jul 2012, 12:30 am
Here is my halfassed F5. The thing is Silent!

(http://instagr.am/p/MhKURfvR0-/)



Title: Buffalo III ES9018 DAC
Post by: GBB on 2 Jul 2012, 01:41 am
I just finished building a DAC based on the Twisted Pear Audio Buffalo III kit.  It has the Buffalo III DAC board with the latest Trident regulators from TP Audio.  I use a single SPDIF input module.  Outputs are transformer coupled using Sowter 1:18.7 transformers.  The output of the Buffalo DAC is loaded with 25ohm resistors.  That combined with the step up of the Sowters gives a "normal" level for the DAC.  I buffer the transformers with a discrete FET buffer so that there is sufficient drive.  I've found that transformer output alone can sound a bit light weight. 
The whole thing is powered by an R-core transformer I got off of ebay - 120v/240v primary with dual 9v and 15v secondaries.  The 9v secondaries are paralleled to drive the digital section and the 15v primaries are rectified and regulated to give +-15v for the FET buffer.  The digital section is regulated using a Placid HD shunt regulator from TP audio while the buffer uses LT1086 adjustable regulators.  I've only had it working for an hour or so but it sounds pretty good so far.  Definitely worth the effort.
I built the DAC in a wooden box.  The bottom is 1/2" baltic birch plywood, while the sides and top are solid oak.  Below are a few pictures of the finished DAC.
---Gary
 

(http://www.audiocircle.com/image.php?id=64635)

(http://www.audiocircle.com/image.php?id=64636)

(http://www.audiocircle.com/image.php?id=64637)
Title: Re: What equipment have you built recently?
Post by: mgalusha on 2 Jul 2012, 01:47 am
Very nice Gary, I built a Buffalo II based DAC in a similar fashion but used Lundahl's on the outputs and it sounds quite nice. I ended up with only a 1V output to keep the Zout down and as you mention, to keep it from sounding a bit thin. I had plenty of gain in my preamp, so this was an acceptable trade in my situation but I like the FET output buffer, lots of drive there.  :thumb:

mike
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 2 Jul 2012, 01:49 am
Nice work Gary! I am just waiting for TP to make their 24bit/192khz compatible USB board and not have to resort to the exaDevices unit.

Best,

Anand.
Title: Re: What equipment have you built recently?
Post by: Bob in St. Louis on 8 Jul 2012, 09:44 pm
I guess you could call this "equipment"......  It helps me listen to music, so I suppose so. :dunno:

When I sit at my computer desk I like to listen to music. The tunes are on a server located in the rack with the rest of my equipment, but I control the tunes remotely via a Samsung Galaxy 10.1 that sits on the desk next to me. I've got a leather case that holds the tablet vertical but the problem with that, is when it's sitting vertical, the charge cord can't plug in because in Samsung's wisdom, they put the charging jack on the bottom. So I can either keep it plugged in and lay it flat, or stand it up and not charge it. Laying flat is hard to read and since it may be on all day, not charging it isn't an option.

I've looked for "off the shelf" solutions and can't find one, so I made one.
I built a stand that holds it up high enough that the cord can still be plugged in.

Oh happy day.   :thumb:

Some day I may put some kind of finish on it. For now, it's just fine.

(http://i85.photobucket.com/albums/k60/BobinStLouis/Crap-n-Stuff/1.jpg)

(http://i85.photobucket.com/albums/k60/BobinStLouis/Crap-n-Stuff/2.jpg)
Title: Re: What equipment have you built recently?
Post by: mgalusha on 8 Jul 2012, 09:48 pm
I like the stand Bob, very nice. I'll bet you had some spare baltic birch left over from one of your many speaker projects. :)
Title: Re: What equipment have you built recently?
Post by: Bob in St. Louis on 8 Jul 2012, 09:51 pm
Quote from: mgalusha on  8 Jul 2012, 09:48 pm
I like the stand Bob, very nice. I'll bet you had some spare baltic birch left over from one of your many speaker projects. :)
Yessir, I do. Thank you for the complement Mike.   :D
Title: Re: What equipment have you built recently?
Post by: mgalusha on 8 Jul 2012, 09:54 pm
They say imitation is the sincerest form of flattery. Well I have an Acer A500 tablet and I may well copy your slick little stand. Now there's a compliment.  :lol:
Title: Re: What equipment have you built recently?
Post by: Bob in St. Louis on 8 Jul 2012, 10:05 pm
Quote from: mgalusha on  8 Jul 2012, 09:54 pm
They say imitation is the sincerest form of flattery. Well I have an Acer A500 tablet and I may well copy your slick little stand. Now there's a compliment.  :lol:
I never thought I'd see the day when you would copy me Mike.  :o

If I had one thing to change, it would be the depth of the back. It's tilted back about 12 degrees and the base doesn't extend far enough rearwards. I was trying to avoid having a huge plywood "structure" sitting on the desk, and wanted to make it slim looking. So if I touch the top of the screen too hard, it's a bit tippy.
Although I think a couple rubber feet in the back would fix that.

Bob
Title: Re: What equipment have you built recently?
Post by: TrungT on 11 Aug 2012, 02:57 am
6A3 / 6H30DR    :thumb:


(http://www.audiocircle.com/image.php?id=66312)

(http://www.audiocircle.com/image.php?id=66313)

Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 11 Aug 2012, 07:17 am
2 stage SET? Nice. Keep it coming... :D

Schematic?

Best,

Anand.
Title: Re: What equipment have you built recently?
Post by: mgalusha on 11 Aug 2012, 12:05 pm
That is sweet Trung, nice!
Title: Re: What equipment have you built recently?
Post by: TrungT on 16 Aug 2012, 04:40 pm
^^^^^
Thanks  :D
Finally finished two matching 6CL6 SEP.
Sound awesome and quiet.  :thumb:

(http://www.audiocircle.com/image.php?id=66527)

(http://www.audiocircle.com/image.php?id=66528)

(http://www.audiocircle.com/image.php?id=66529)

Title: Re: What equipment have you built recently?
Post by: Bob in St. Louis on 16 Aug 2012, 05:00 pm
I'll trade you that for some smoked salmon in oil?
Title: Re: What equipment have you built recently?
Post by: TrungT on 16 Aug 2012, 05:08 pm
 :thumb:
You are funny  :rotflmao: :rotflmao: :rotflmao: :rotflmao:
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 16 Aug 2012, 05:14 pm
That's my boy. Great work Trung. :hyper:

Anand.
Title: Re: What equipment have you built recently?
Post by: TrungT on 16 Aug 2012, 06:28 pm
Thank you.
Big thanks for friend of mine, he did all the hard work (wood and metal works)
 :thumb:

Bob: is smoked salmon in oil = Mundorf Silver/Gold/Oil
If it does, we have a deal  :lol: :lol: :lol: :lol:
Title: Re: What equipment have you built recently?
Post by: Bob in St. Louis on 16 Aug 2012, 09:02 pm
EVOO  :wink:
Title: Re: What equipment have you built recently?
Post by: mgalusha on 26 Aug 2012, 03:35 am
For years I've been using plain old resistors for amplifier loads but the largest I had was rated at 100W and they became hot very quickly. Some Google searches turned up a suggestion to use heating elements as loads. A bit of searching on Amazon turned up some Emerson/Maytag dryer heating elements. They are rated for 4750W each, no issues with capacity and just over $20 each delivered, so worth a shot. One thing that was an unexpected bonus, the coils are wound in opposing directions for each row, making the load essentially non-inductive. The LCR bridge shows only about a 20mOhm difference between 100Hz and 10kHz, close enough.

The overall resistance is about 10.6R, so I simply measured from each end to find the 4R point, cut the coils at that spot and tied them together along with some 10GA wire. This allows for 8, 4 and 2 Ohm loads with various jumper connections. I finally got around to mounting them in something non flammable and with plenty of airflow. I purchased the chassis from JoshK many years ago and we used it at work for a drive array until recently. It was going to the trash and it occurred to me that it would make a dandy housing for this purpose. All the other components except for the fan and banana jacks were scrap bits; much to the agony of my wife, I am a pack rat. The front plate was some leftover 2U rack mount panel, the brackets one the wire end of the loads were from a failed transformer, the other brackets from a dead amp, they originally held some heat sinks. Some aluminum angle for the panel mount, no idea where it came from but it was a freebie, some extra holes but they don't matter.  :lol:

Not pretty, very industrial but works well. The fan is rated at 195CFM and even with 1200W into 2R I didn't have any heat problems. :) The best part is I have less than $100 invested, excluding the original cost of the chassis and that has long since been recouped.


(http://www.audiocircle.com/image.php?id=66853)


(http://www.audiocircle.com/image.php?id=66855)


(http://www.audiocircle.com/image.php?id=66854)

mike
Title: Re: What equipment have you built recently?
Post by: TrungT on 26 Aug 2012, 03:49 am
 :bowdown:
 :scratch:
You do need help  :wink:
Title: Re: What equipment have you built recently?
Post by: mgalusha on 26 Aug 2012, 03:51 am
Quote from: TrungT on 26 Aug 2012, 03:49 am
:bowdown:
 :scratch:
You do need help  :wink:

Never any question about that. :)
Title: Re: What equipment have you built recently?
Post by: JohnR on 26 Aug 2012, 04:09 am
Do heating elements change resistance with temperature?
Title: Re: What equipment have you built recently?
Post by: mgalusha on 26 Aug 2012, 01:29 pm
Quote from: JohnR on 26 Aug 2012, 04:09 am
Do heating elements change resistance with temperature?

Yes they do and that is why I put the biggest fan I could fit into the case. :)

I did test it, the measured resistance changes by about .1R after 10 minutes with my heat gun on high and no fan running, the chassis and the elements were very hot after this time. The IR thermometer showed the element at about 100C but that cannot be 100% correct as the IR probe is calibrated for black body radiation, so it was possibly hotter.

Shutting off the heat gun and engaging the fan caused the resistance to return to normal in less than 20 seconds, so during normal use I don't expect much change; the fan will of course be running before any testing occurs and for THD+N vs Power sweeps, the amplifiers are only pushed to high power for a few seconds, even when using a 100 step sweep (the default is 30 steps).

mike
Title: Re: What equipment have you built recently?
Post by: orientalexpress on 26 Aug 2012, 01:48 pm
you guys are crazy :o,but in a good way  :thumb:


lapsan
Title: Re: What equipment have you built recently?
Post by: TomS on 26 Aug 2012, 02:45 pm
Crazy creative is what that is. I love it  :green:
Title: Re: What equipment have you built recently?
Post by: Bob in St. Louis on 26 Aug 2012, 03:08 pm
Wow. That's using your noggin!  :thumb:
A nice space heater for those long cold winters too.  :lol:
Title: Re: What equipment have you built recently?
Post by: Speedskater on 26 Aug 2012, 03:45 pm
The temperature question came up at work decades ago.  So we used some big power resistors (maybe 250 or 500 watt)  put some thermocouples on them, heated them up, pulled the plug and measured temp and resistance as they cooled.  The resistance value oscillated around the room temp value as they cooled.  Those oscillations were rather small.
Title: Re: What equipment have you built recently?
Post by: TrungT on 30 Aug 2012, 10:13 pm
12VDC Linear PWS 15A

(http://www.audiocircle.com/image.php?id=66996)

(http://www.audiocircle.com/image.php?id=66997)
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 9 Jul 2013, 11:26 am
My Bent Audio TAP-X build here:
http://www.audiocircle.com/index.php?topic=118082.msg1240373#new

Best,
Anand.
Title: Re: What equipment have you built recently?
Post by: hydrovac on 25 Jul 2013, 12:30 pm
Hi, posting some pictures of LM3875 Gain-clone amp build. One of my earlier projects.

(http://farm4.staticflickr.com/3756/9104827225_795a46c2a0.jpg) (http://www.flickr.com/photos/97860410@N03/9104827225/)
IMG_4342 (http://www.flickr.com/photos/97860410@N03/9104827225/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

(http://farm4.staticflickr.com/3776/9142751740_f10da60b3f.jpg) (http://www.flickr.com/photos/97860410@N03/9142751740/)
IMG_4430 (http://www.flickr.com/photos/97860410@N03/9142751740/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

(http://farm8.staticflickr.com/7343/9140532679_df7b826ee1.jpg) (http://www.flickr.com/photos/97860410@N03/9140532679/)
IMG_4429 (http://www.flickr.com/photos/97860410@N03/9140532679/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

(http://farm8.staticflickr.com/7420/9140514489_8743b2a296.jpg) (http://www.flickr.com/photos/97860410@N03/9140514489/)
IMG_4428 (http://www.flickr.com/photos/97860410@N03/9140514489/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

(http://farm6.staticflickr.com/5461/9104548081_c24dd19316.jpg) (http://www.flickr.com/photos/97860410@N03/9104548081/)
IMG_4319 (http://www.flickr.com/photos/97860410@N03/9104548081/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

(http://farm4.staticflickr.com/3695/9106771214_49aa3dd5e3.jpg) (http://www.flickr.com/photos/97860410@N03/9106771214/)
IMG_4321 (http://www.flickr.com/photos/97860410@N03/9106771214/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

(http://farm8.staticflickr.com/7316/9106766044_979f6f4240.jpg) (http://www.flickr.com/photos/97860410@N03/9106766044/)
IMG_4322 (http://www.flickr.com/photos/97860410@N03/9106766044/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

(http://farm3.staticflickr.com/2873/9104531207_92cdbd047e.jpg) (http://www.flickr.com/photos/97860410@N03/9104531207/)
IMG_4323 (http://www.flickr.com/photos/97860410@N03/9104531207/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr
Title: Re: What equipment have you built recently?
Post by: hydrovac on 25 Jul 2013, 12:50 pm
TDA7293 MOSFET based 2.1 integrated amp project.

Few pictures of the project.

(http://imageshack.us/a/img811/7849/img4146gq.jpg)

(http://imageshack.us/a/img845/8687/img4143u.jpg)

(http://imageshack.us/a/img32/8050/img4142ia.jpg)

(http://imageshack.us/a/img18/2544/img4141tu.jpg)


Completed Amp. Waiting for finish.

(http://farm3.staticflickr.com/2871/9107321136_5af4bd22dc.jpg) (http://www.flickr.com/photos/97860410@N03/9107321136/)
IMG_4383 (http://www.flickr.com/photos/97860410@N03/9107321136/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr


(http://farm6.staticflickr.com/5472/9107328414_140df18b02.jpg) (http://www.flickr.com/photos/97860410@N03/9107328414/)
IMG_4382 (http://www.flickr.com/photos/97860410@N03/9107328414/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

(http://farm4.staticflickr.com/3753/9105124499_4bddba7deb.jpg) (http://www.flickr.com/photos/97860410@N03/9105124499/)
IMG_4370 (http://www.flickr.com/photos/97860410@N03/9105124499/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr

(http://farm4.staticflickr.com/3831/9104772957_1dc4b0e340.jpg) (http://www.flickr.com/photos/97860410@N03/9104772957/)
IMG_4374 (http://www.flickr.com/photos/97860410@N03/9104772957/) by hydrovac (http://www.flickr.com/people/97860410@N03/), on Flickr









Title: Re: What equipment have you built recently?
Post by: TrungT on 25 Jul 2013, 03:29 pm
Hydrovac.
Nice build, thanks for sharing.  :thumb:
Title: Re: What equipment have you built recently?
Post by: hgao3xbolt on 20 Jun 2014, 10:59 am
My Aikido ACF2

(http://www.audiocircle.com/image.php?id=101187)

(http://www.audiocircle.com/image.php?id=101188)
Title: Re: What equipment have you built recently?
Post by: mgalusha on 6 Oct 2014, 03:58 pm
I built these over the summer for a friend. He likes them, which was the desired result.

(http://www.audiocircle.com/image.php?id=106404)

(http://www.audiocircle.com/image.php?id=106405)

(http://www.audiocircle.com/image.php?id=106406)

(http://www.audiocircle.com/image.php?id=106407)

43x16x20", about 200lbs. Faital pro main driver, Beyma AMT HF driver, 2 x CSS subs with Hypex DSP controlled 2 x 400W amp per speaker. Step down transformer to convert speaker to line level balanced to drive the sub amp. ~98dB/M/W. Being that I'm not a woodworker I'm pretty happy with the result. The folks who have heard them seem to like them.
Title: Re: What equipment have you built recently?
Post by: Bob in St. Louis on 6 Oct 2014, 04:02 pm
Look pretty cool Mike!
The workshop looks like it's serving you well too.  :wink:
Title: Re: What equipment have you built recently?
Post by: mgalusha on 6 Oct 2014, 04:07 pm
Quote from: Bob in St. Louis on  6 Oct 2014, 04:02 pm
Look pretty cool Mike!
The workshop looks like it's serving you well too.  :wink:

Thanks Bob. A lot of dust this summer. Nothing makes a mess quite like a router and when the panels are 5 layers thick.. yeah, a hell of a mess.
Title: Re: What equipment have you built recently?
Post by: Bob in St. Louis on 6 Oct 2014, 04:12 pm
Ohh....Amen to that.  :duh:
The single most productive piece of equipment I own is the dust collector.
That thing has saved me more time than any other tool in the workshop.

Kinda reminds me of when audio guys get around to acoustically treating their room, they say, "I wish I would have done that sooner".
Yea. It's like that.  :lol:
Title: Re: What equipment have you built recently?
Post by: mgalusha on 6 Oct 2014, 04:16 pm
Quote from: Bob in St. Louis on  6 Oct 2014, 04:12 pm
Ohh....Amen to that.  :duh:
The single most productive piece of equipment I own is the dust collector.
That thing has saved me more time than any other tool in the workshop.

Kinda reminds me of when audio guys get around to acoustically treating their room, they say, "I wish I would have done that sooner".
Yea. It's like that.  :lol:

I have a 5HP cyclone collection system, which would have been installed this summer but then the speaker project occurred and as he plans to use them for RMAF, I had a rather fixed deadline and getting them done consumed all available time.
Title: Re: What equipment have you built recently?
Post by: Bob in St. Louis on 6 Oct 2014, 04:25 pm
Roger that.
Having a big mess now will just make you appreciate just that much more once you get it up and running.
Title: Re: What equipment have you built recently?
Post by: JoshK on 6 Oct 2014, 05:44 pm
Wow, those look great!  Which Faital did you use?  Very nice form factor.

Title: Re: What equipment have you built recently?
Post by: mgalusha on 6 Oct 2014, 05:50 pm
Quote from: JoshK on  6 Oct 2014, 05:44 pm
Wow, those look great!  Which Faital did you use?  Very nice form factor.

Thanks Josh. I used the 12FH530 (http://www.faitalpro.com/en/products/LF_Loudspeakers/product_details/index.php?id=151050108).
Title: Re: What equipment have you built recently?
Post by: Pjotter on 15 Nov 2014, 05:11 pm
Last thing i've build:

(https://lh6.googleusercontent.com/-qbP69fCRdmo/VGd7K5s24HI/AAAAAAAAKOQ/oW-N9-ssFXc/w869-h577-no/DSC_1588.JPG)

(https://lh4.googleusercontent.com/-GBV-jX6wc1I/VGd7N3204mI/AAAAAAAAKOo/MZfrgRziOfw/w869-h577-no/DSC_1591.JPG)

(https://lh6.googleusercontent.com/-KguLWF-vFik/VGd7O4kmlyI/AAAAAAAAKOw/7U1qbvXLT5w/w869-h577-no/DSC_1592.JPG)

 :green:
Title: Re: What equipment have you built recently?
Post by: poseidonsvoice on 4 Dec 2015, 04:52 pm
My phono stage build is here:

http://www.audiocircle.com/index.php?topic=139171.0

Best,
Anand.
Title: Re: What equipment have you built recently?
Post by: sebrof on 4 Dec 2015, 08:10 pm
I built these a couple of months ago. Altec 416 and Heil AMT
(http://www.audiocircle.com/image.php?id=132965)

(http://www.audiocircle.com/image.php?id=132966)
Title: Re: What equipment have you built recently?
Post by: stereocilia on 14 Mar 2016, 03:09 am
My 14 year-old helped me build the Fusion-6 by Matt Grant http://www.diysoundgroup.com/waveguide-speaker-kits/fusion-6.html (http://www.diysoundgroup.com/waveguide-speaker-kits/fusion-6.html)
They sound great -- dynamic and natural. They do not have pants-flapping bass, but they sound plenty big and they can play loud without strain.
The biggest lesson we learned is that finishing speakers takes skill and patience, especially when doing things the hard way, which looks deceptively like the easy way. It's presentable, especially for a bedroom system on bookshelves, but if I were to do it again I would work harder (and smarter) on the paint job.
Anyway, we are really happy with the sound. This was a fun project.
The response graph was made by averaging three mic positions in a two-foot arc around the listening position from 8 ft. away.

(http://www.audiocircle.com/image.php?id=138998)(http://www.audiocircle.com/image.php?id=138999)

(http://www.audiocircle.com/image.php?id=139001)(http://www.audiocircle.com/image.php?id=139000)


(http://www.audiocircle.com/image.php?id=139002)



Title: Re: What equipment have you built recently?
Post by: straitwire on 4 Oct 2020, 12:55 pm
Hey everybody, I built a remote controlled passive preamp with three inputs and a separate headphone section using a voltage divider to listen to my amps thru my headphones.
 The remote uses radio frequency instead of infrared.

(https://www.audiocircle.com/image.php?id=215441)
Title: Re: What equipment have you built recently?
Post by: Mikerodrig27 on 12 Nov 2020, 02:16 pm

Working on rebuilding a set of forte II's that had trashed cabinets.

(https://www.audiocircle.com/image.php?id=216884)