Customer Projects & Pics with the LDR3x Preamp Controller

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tortugaranger

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Check out this VERY nice DIY passive preamp project that one of our LDR3x customers put together and posted over at DIYAudio. Excellent workmanship.  :thumb:

http://www.diyaudio.com/forums/vendors-bazaar/230114-tortuga-audio-ldr3x-diy-preamp-controller-w-remote.html#post3631154

poseidonsvoice

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Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #1 on: 13 Sep 2013, 11:02 pm »
I quite agree. Very nicely done. DIY rocks!  :thumb:

Best,
Anand.

glynnw

Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #2 on: 18 Sep 2013, 07:19 pm »
My simple implementation.  Infrared receiver in upper left corner in inside view.  Signal wire is very short solid siver and have solid copper RCAs on order for rear.







TrungT

Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #3 on: 22 Sep 2013, 10:29 pm »



 


 

TrungT

Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #4 on: 22 Sep 2013, 10:31 pm »






 

TrungT

Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #5 on: 22 Sep 2013, 10:34 pm »



 


  

WireNut

Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #6 on: 22 Sep 2013, 11:17 pm »
TrungT,

Very cool. I like the orange paint  :thumb: The LED shining thru the smoke front was a great idea. Very cool looking to me  8)
Is that a Par-Metal or Hammond case?





tortugaranger

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Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #7 on: 22 Sep 2013, 11:29 pm »
That's what I call Chevy V8 engine block orange. Go bold or go home! Nice work. How's it sound?

TrungT

Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #8 on: 23 Sep 2013, 02:26 am »

Thank you.  :D 
The remote control work smoothly, sound great at low to high volume.
Sound awesome with Auralex Vega, and will test with MyteK DAC next week.


TrungT

Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #9 on: 22 Oct 2013, 11:48 pm »
Another build for a friend, unbalanced.
 


 


  

Bob in St. Louis

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Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #10 on: 23 Oct 2013, 12:57 am »
I didn't know TT was a DIYer!?!?!?
Well done, beautiful work Sir!

TrungT

Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #11 on: 23 Oct 2013, 01:15 am »
^^^^^
Thank you.   ;)

playntheblues

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Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #12 on: 23 Oct 2013, 01:24 am »
Nice work Trung. I couldn't believe all of your projects on the table and on the shelve.  You rock :rock: :rock: :rock:

TrungT

Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #13 on: 25 Oct 2013, 02:45 am »
Thank you.
So much to do and so little time.  ;)

MikeLdiy

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Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #14 on: 8 Nov 2013, 03:38 am »
Wow, everyone has a great looking build!  I need mechanical skills but thought I'd post some pics anyways.  Made a mistake on one of the PCBs and still need to clean up the wiring but it works!  Sounds good too.  Used LDRs as input switches instead of relays.






Cheers,

tortugaranger

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Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #15 on: 8 Nov 2013, 04:19 pm »
Here's a pic a recent LDR3x customer send me. Nice compact layout and wiring.

Cheers,
Morten



tortugaranger

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Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #16 on: 8 Nov 2013, 04:22 pm »
Used LDRs as input switches instead of relays.

Thanks for posting this Mike.
How did you pull off the LDR based input switching in terms of the circuit board etc? This may be something others would be very interested in.

Cheers,
Morten

MikeLdiy

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Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #17 on: 8 Nov 2013, 07:35 pm »
Hi Morten,

First off, thanks for the product for the DIY community.  This makes tweaking and playing a reasonably affordable hobby!  Also, great implementation using the LDRs!!  They are a beast to work with.  Can't imagine the time spent matching these things!

Regarding the LDR switching, I have the single ended version of the LDR3x:
1.  I took the +5.0V from your on-board regulator coming out of the power terminal +5.0V and used this as power for the LDR diode.  I 've powered the unit via a +12V linear regulator.
2.  Series POT multiturn resistor from +5.0V to LDR diode (anode).  Value was 500R set to 250R.  Used one each for left and right channels.  This of course is times 3 because of the 3 input selection coming from your board so 6 in total.
3.  GND is not connected to the "bottom"/"negative/cathode of the LDR diode.  This is left floating.
4.  Connected the cathode of the LDR from each *channel* to the "In1","In2", "In3" of your board.
5.  Paralleled all the Left channel source inputs after the LDR resistors (other side of course connected to source).
6.  Paralleled all Right channels sources, same as above.  This gives the switched L and R signals that go into RI and LI of your board.
7.  GND of all sources are connected together and plumbed to AG to your board.
8.  Took the DMM and monitored the resistor value of the LDR with no loads or sources connected.  Tweaked the POT till each LDR resistance was 50 ohms.  As close as I could get it.  Use the SR3 version of LDR from Newark.  Pulling around 16mA through the LDR diode.
9.  Did not test for repeatability, temperature or anything else.

One thing to note is the LDR resistance does't change on a dime so there is some area while switching that the LDR is between sources and possibly lowish resistance.  Seems to work fine at home right now though.  I've tried 2 sources full ON and did some switching.  Everything survived but I can not guarantee this will work for everyone; however, this may not be a big deal, just something I noticed.  I made a custom PCB for myself that has LDR footprint and relay footprints in parallel just in case.  You could easily do this without a PCB though.

Let me know if you need more information, sorry for the fast typing, a bit short on time, thanks again!

Cheers,
Mike

MikeLdiy

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Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #18 on: 10 Nov 2013, 05:11 pm »
Couple of last pics.  Got front panel LEDS on.  Got all the boards mounted with more room to spare than I thought :duh:.
LDR3x Tortuga Board :icon_twisted:, Low noise power supplies based on TPS7A4700RGWT and TPS7A3301RGWT for phono stage and LDR3x, phono stage (MM and MC) and Input Switch boards!  Still need to clean up wiring but have to do a long listening session, so far sounding really good!  Convenience is great too!  Looking forward to more Tortuga Products!





ClefChef

Re: Customer Projects & Pics with the LDR3x Preamp Controller
« Reply #19 on: 14 Nov 2013, 02:18 am »








I would imagine that 15V walwart supply would work just as well, with some internal regulation for input relays, and that is what I will do on my next project. I also installed a ground lift switch which I found to be a necessity in some situations.