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Old 22nd November 2016, 09:09 PM   #1
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Default Best capacitors for power supplies update

Electrolytic capacitors types for power supplies come and go. They attend different demands than stages interface or other more subtle applications.

Some are large and recommended for main raw filtering, usually before regulators. Some are small and have to take care of smaller currents.

Raw supply filtering usually requires low-esr and high temperature, even if large cans rarely fulfill any of those. That's why some people use smaller caps wired in parallel. Caps after regulators usually DON'T have to be low-esr.

The question is which brand types have worked for you in both places.
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Old 23rd November 2016, 12:12 PM   #2
AndrewT is offline AndrewT  Scotland
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I find that providing adequate MF and HF supply rail decoupling at the load removes the need for anything fancy/exotic at the main smoothing (or bank of) capacitors.
Standard commercial grade capacitors that meet specification are good enough.

Omit the supply rail decoupling and you have a completely different operating regime.
Transients at the load demand extra current and the long supply lines prevent most of that demand being met. This is audible. Fiddling about with capacitors has become audible, because they try to send transient current through the long inductive connections. Sort the decoupling and this dependance on the PSU dissappears.
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Old 23rd November 2016, 12:57 PM   #3
Gopher is offline Gopher  United Kingdom
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There may well be audible differences between different types of capacitors for a given power supply/amplifier setup, but it's far more likely to be due to differences in impedances and resonances which may be specific to that circuit rather than the magical properties oft claimed for some brands of capacitors.

Stick to solid industrial types, use lots of them, keep wiring short and thick and have good local decoupling as Andrew T suggests and you won't go far wrong.

Last edited by Gopher; 23rd November 2016 at 01:00 PM.
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Old 23rd November 2016, 01:02 PM   #4
gadut is offline gadut  Indonesia
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Quote:
Originally Posted by carlmart View Post
The question is which brand types have worked for you in both places.
visit as many as online store that you can find such pcx, hificoll,mpercy,farnell,mouser,digikey then find the one that fit your wallet
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Old 23rd November 2016, 03:11 PM   #5
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Oh, I don't believe in magic for audio. Music is magic, but retrieving recorded sound is filled with pitfalls.
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Old 23rd November 2016, 03:46 PM   #6
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Quote:
Originally Posted by carlmart View Post
Oh, I don't believe in magic for audio. Music is magic, but retrieving recorded sound is filled with pitfalls.
Hi South American neighbour!

This guy sales magic. Or smoke?

Try it? ;-)
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Old 23rd November 2016, 04:40 PM   #7
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Three 3.3 Farad super caps in series would seem like your class A runs on batteries.
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Old 23rd November 2016, 09:10 PM   #8
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Old 23rd November 2016, 09:51 PM   #9
cbdb is offline cbdb  Canada
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What's the output impedance of those supercaps?
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Old 24th November 2016, 02:23 PM   #10
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Originally Posted by cbdb View Post
What's the output impedance of those supercaps?
About 1/(2π * f [Hz] * C [Farad])
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