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-   -   Best capacitors for power supplies update (http://www.diyaudio.com/forums/power-supplies/299666-capacitors-power-supplies-update.html)

carlmart 22nd November 2016 08:09 PM

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.

AndrewT 23rd November 2016 11:12 AM

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.

Gopher 23rd November 2016 11:57 AM

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.

gadut 23rd November 2016 12:02 PM

Quote:

Originally Posted by carlmart (http://www.diyaudio.com/forums/power-supplies/299666-capacitors-power-supplies-update-post4894521.html#post4894521)
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

carlmart 23rd November 2016 02:11 PM

Oh, I don't believe in magic for audio. Music is magic, but retrieving recorded sound is filled with pitfalls.

Osvaldo de Banfield 23rd November 2016 02:46 PM

Quote:

Originally Posted by carlmart (http://www.diyaudio.com/forums/power-supplies/299666-capacitors-power-supplies-update-post4895272.html#post4895272)
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? ;-)

Nico Ras 23rd November 2016 03:40 PM

Three 3.3 Farad super caps in series would seem like your class A runs on batteries.

carlmart 23rd November 2016 08:10 PM

:D

cbdb 23rd November 2016 08:51 PM

What's the output impedance of those supercaps?

Osvaldo de Banfield 24th November 2016 01:23 PM

Quote:

Originally Posted by cbdb (http://www.diyaudio.com/forums/power-supplies/299666-capacitors-power-supplies-update-post4895678.html#post4895678)
What's the output impedance of those supercaps?

About 1/(2π * f [Hz] * C [Farad])


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