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