How to clean the DC at mains. And ripple too.

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maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #100 on: 22 Apr 2018, 10:27 am »
Yesterday, Saturday, 238V -> bad sound in my two systems.

Sunday, 234V -> very good sound in my second system.

Variac?

maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #101 on: 26 Apr 2018, 08:49 am »
Alternative to the expensive Mundorf MGO capacitors. But are screw terminal.


KEMET PEH200 Series, +85°C

[PDF] http://www.kemet.com/Lists/ProductCatalog/Attachments/391/KEM_A4034_PEH200.pdf




Cheap here:

http://www.elektrodump.nl/en/51-elco-low-voltage

Elco / KEMET low voltage 47000uF 63V 85ºC  € 10

-> http://www.elektrodump.nl/en/elco-low-voltage/2222-elco-low-voltage-47000uf-63v.html

maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #102 on: 4 May 2018, 07:01 pm »
I was informing about Don Sachs DS-2, very very very interesting 6SN7 tube preamplifer.

http://www.dsachsconsulting.com/custom%20line%20stage.html

http://www.tubes4hifi.com/SP14.htm

and I see two white ferrites inside!



Don Sachs SP14 Tube Preamp Review

https://www.audiocircle.com/index.php?topic=138092.0

maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #103 on: 4 May 2018, 07:57 pm »
Custom KT88 Tube Amplifier

http://www.dsachsconsulting.com/custom%20kt88%20tube%20amp.html

It has a RF/EMI filter inlet!


maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #104 on: 5 May 2018, 09:36 am »
New and very promising thread by Jean Paul, aka JPS64, and the new design!

Univeral Power Amplifier Control Center UPACC

http://www.diyaudio.com/forums/solid-state/322282-univeral-power-amplifier-control-center-upacc.html#post5424517

Quote
Some power amplifier needs temperature monitoring.

Some amplifier needs fan control like ALPHA BB.

They´re builders who want VU-Meter or FFT real time visualization.

All power amplifier needs AC main power filtering; perhaps controlled powering.

Some power amplifier owner needs DC blocking.

All power amplifiers needs inrush current limiter.

Power amplifiers works with 115/230VAC 50/60Hz.

Some owners wants volume control.

And at last (but not least), some owners prefers symetrical inputs.


maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #106 on: 16 May 2018, 08:16 am »
http://www.diyaudio.com/forums/vendor-s-bazaar/310402-fs-ultra-low-noise-power-supply-lt3045-based-pcb-post5435017.html

by Cornan

Quote
I already do, but a balanced one (plus a DC blocker trap filter in front of it) that looks like this internally.

[IMG] https://www.computeraudiophile.com/uploads/monthly_2017_09/20170926_194113-1.jpg.465d8fe5474a6cbd36a0b90570ac9dea.jpg


It is connected to this star-earthed power distributor.

[IMG] https://www.computeraudiophile.com/uploads/monthly_2017_09/20170926_193942-1.jpg.ee5469d436c687ac7c13ff8f640592b0.jpg


This balanced *floating* isolation transformer together with the LT3045s in series is actually the biggest reason why I want to build my LPSUs.

As you can see on the picture there is a switch on the balanced isolation transformer where I can choose to *float* or *ground*. No contest in my setup. *Floating* sounds by far the best.


Both are custom made by Aleksandar (ATL Hi-Fi).

https://www.atlhifi.com/

maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #107 on: 26 May 2018, 09:52 am »
United Chemi-Con GPD miniature electrolytics

[PDF] https://www.mouser.com/datasheet/2/420/UCC_GPDDatasheet-1210831.pdf


I have only found available: 7500uF 35V EGPD350ELL752MM40H

https://www.mouser.es/ProductDetail/United-Chemi-Con/EGPD350ELL752MM40H?qs=IYueExuAvkp0C0aPkPvYcQ%3d%3d

3,74 €

maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #108 on: 26 May 2018, 09:54 am »
[PDF] http://www.mundorf.com/english%201.1/Broschuere%20Einzelseiten/MLGO.pdf




Imagine a new PCB with 2+2 Chemi-Con GPD capacitors... 1+1 en parallel -> 9 mOhms, and only EUR 7.5.

Or the current PCB and a little bit of skill.

And a DCBx4 with 4+4 Chemi-Con GPD caps.

Problem to compare, especially the ripple current: Chemi-con measures are at 100 kHz and Mundorf at 100 Hz

maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #109 on: 26 May 2018, 04:42 pm »
New assembled product from ATL Hi-Fi (Aleksandar):

Combined module Soft Start (inrush current limiter) & DC Blocker (trap, filter) – assembled in case

https://www.atlhifi.com/shop/fully-assembled-devices/combined-module-soft-start-inrush-current-limiter-dc-blocker-trap-filter-assembled-in-case/


with the space to add a RF/EMI filter too. This is: Schaffner FN2090-16-06

http://uk.farnell.com/schaffner/fn2090-16-06/filter-1-ph-16a-chassis-mount/dp/1304862?st=FN2090

dtoss

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Re: How to clean the DC at mains. And ripple too.
« Reply #110 on: 8 Oct 2018, 09:37 pm »
Hi Maty
I read thru at least half of the postings but not all. Am very interested in the ATL DCB.
Seems you like the single DCB with your Mundorf MLGO 47000uF 25V upgrade best, as an improvement over the stock EPCOS from ATL.
And that the stock ATL DCB was quite decent.
Would you say that it's good enough to use just 1 DCB because the improvement is low relative to the doubling or quadrupling of costs to do DCBx2 or DCBx4.
My AC mains is not bad, don't have noticeable transformer hum.
I'm thinking to setup a DCB for my Parasound JC1 monoblocks amps, which use a 1,700VA transformer each. So maybe I should concentrate on getting enough current capacity rather than using DCBs in series, right?
Best rgds,
Denis

maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #111 on: 12 Nov 2018, 04:59 pm »
News! DC Blocker v2

https://www.atlhifi.com/shop/populated-pcb/fully-populated-dc-blocker-pcb/


Quote
but now the board is TWO-layer design which allows the current handling capabilities of the board to be doubled. All current conducting traces are widened as much as possible which additional raise the max. handled current.

PCB has solder mask coating on top and bottom layer for best durability.

DC Blocker is built with following parts:

– two MASSIVE 33,000 uF EPCOS capacitors
one high-current Rectifier Block
– one 10W power resistor
– one WIMA MKS4 400VAC capacitor
– two MOLEX 3-terminal connectors for AC input/output
– one PCB for DC Blocker.

maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #112 on: 12 Nov 2018, 05:02 pm »
and HIGH-POWER DC Blocker Trap Filter – Assembled Device

https://www.atlhifi.com/shop/fully-assembled-devices/high-power-dc-blocker-trap-filter-assembled-device/


Quote
Here is offered a fully assembled device capable to handle VERY HIGH CURRENTS (up to 30 Amperes!!!).

Because of such high currents using a standard PCBs is not possible. Instead of that a 2mm thick pure copper bussbars are used to connect the filter’s parts.

In order to carry such high loads the part’s values are upraised accordingly:

– FOUR MASSIVE 47,000 uF High-Quality KEMET capacitors
50 Amperes rated Bridge Rectifier
– one 25W power resistor
2 mm thick pure copper bussbars used for connection of the filter’s part.

maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #113 on: 12 Nov 2018, 05:26 pm »
Sorry I am late.

...My AC mains is not bad, don't have noticeable transformer hum.
I'm thinking to setup a DCB for my Parasound JC1 monoblocks amps, which use a 1,700VA transformer each. So maybe I should concentrate on getting enough current capacity rather than using DCBs in series, right?

The new High-Power DC Blocker to 1,700 VA maybe is what you need.

Send a e-mail to Aleksandar. Or maybe the new High-Power was made to you!

WireNut

Re: How to clean the DC at mains. And ripple too.
« Reply #114 on: 12 Nov 2018, 06:02 pm »
Hi Maty,

I finally finished my first DIY project. It uses Sjostrom Audio's DCT03 blocker and 3 Fo-Felix EMI filters.
I tried it out on an old receiver and it's working perfectly. I only wish I had some test equipment to make some measurements.

Anyway, I thought I'd upload some photos to show you, and maybe get some feedback.
I decided to only hook-up the blocker to the 17 amp coil that goes to the power amp outlet.

Do you think that's the best way to do it, or should I hook-up the blocker to all the outlets?  (One 17 amp coil, and two 3 amp coils for sources).

The paint job will end up being black lacquer on the front, black hammered paint on the sides and silver metallic on the rear. The blue was an experiment.

Thanks









maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #115 on: 12 Nov 2018, 08:42 pm »
Trial and error like me.

Go adding to the chain. When you notice loss of quality in the sound instead of improving, it is that the attenuation is excessive and reduces the dynamics.

Now I have only the DC Blocker x4 ME with the Marantz because I have less noise in the grid. And DCB (Mundorf) + DCB + DCBx2 with the Yamaha.

And I added mass to my cheap tweaked KEF Q100 coaxial speakers. With ALL the tweaks they sound much better than new. KEF skimmed on the furniture, with thin DM walls. Now, with less ressonances, better and more clear sound.

And I have optimized more my Win10 Pro 64 bits 1709 to play multimedia -> better sound again. They tell me and I do not believe it!

In my Linux I have not been able to improve both the sound  :(

It is fundamental to optimize the OS and you do not have to spend a penny!

maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #116 on: 12 Nov 2018, 09:08 pm »
Just now I have opened an e-mail from Aleksandar with pictures.

ATL-Hi-Fi DC Blocker High power with BIG transformer (*)


(*) It seems a balanced isolation transformer + DC Blocker High power


"currently I'm working on a case for the High-power version"


« Last Edit: 12 Nov 2018, 10:24 pm by maty »

maty

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Re: How to clean the DC at mains. And ripple too.
« Reply #117 on: 12 Nov 2018, 10:33 pm »