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Old 18th May 2016, 07:09 PM   #1
Jrp27 is offline Jrp27  India
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Default Capacitors for power supply

Quick question....

I am getting some cheap 10,000 uf,100v caps for power supply about $3 each.

My question is that when it comes to power supplies do the quality of caps matter?

Would it make a difference in sound quality if I go for cheaper caps in power supply rather then expensive nichicon /elna ones?
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Old 18th May 2016, 07:18 PM   #2
Mooly is offline Mooly  United Kingdom
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Quality matters greatly. Look at the specs for E.S.R. (equivalent series resistance) and maximum allowable ripple current.

On top of all that, some obscure brands are poor performers and many cheap caps are fakes. Its common to see a supposed 10,000uf 63 volts cap (say) that is really an empty can with a cheap 2200uf 35 volt soldered internally.

Usually... you get what you pay for.
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Old 18th May 2016, 07:47 PM   #3
Retsel is offline Retsel  United States
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Default Power supply capacitors

Consider purchasing 4 pole capacitors. Manufacturer of this style of caps is Jensen, while another is DNM (Supertech). These capacitors are very low ESR and provide some filtering of the incoming signal.

Retsel
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Old 18th May 2016, 09:12 PM   #4
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the better you desing and build your power supply the better the result is ( sound) , especialy the caps , I run Mundorfs one and I am very happy of them , not cheap at all , but as Mooly says "Usually... you get what you pay for." ;-)

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Old 19th May 2016, 01:57 PM   #5
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Main supply caps shouldn't matter that much. They should be to feed the quicker and smaller low esr caps near the amp. If main psu caps matter much, then the rest of the amp is not built too well.
It is also true that for 3$ you may get fake caps as mentioned before. Lower voltage and or lower storage.
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Old 19th May 2016, 02:40 PM   #6
AndrewT is offline AndrewT  Scotland
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$3 for a 10mF, 100V capacitor is cheap, maybe too cheap.
Be wary of fake !
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Old 19th May 2016, 05:45 PM   #7
Jrp27 is offline Jrp27  India
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Got it...so no more cheap Chinese caps...
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Old 19th May 2016, 06:42 PM   #8
Pafi is offline Pafi  Hungary
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You can measure basic performance. Capacitance, ESR, leakage current at nominal voltage. If they are good, you won.
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Old 20th May 2016, 05:50 AM   #9
us1070 is offline us1070  India
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I measured the $3 caps and they give reading of 10000uf on capacitance meter
ESR in high in cheap caps and voltage drop little faster then a original Japanese brand and voltage could be overated.

And i have a question about capacitor voltage:
Till under 100v caps are cheap then it gets a jump in price

limited at 90vdc rails for 100v caps and so is it worth the extra cost for 110vdc rails does this 20vdc make a huge difference in amplifier wattage?

Last edited by us1070; 20th May 2016 at 06:03 AM.
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Old 20th May 2016, 08:16 AM   #10
AndrewT is offline AndrewT  Scotland
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Reform your 100V capactors very slowly up to 100V and measure the leakage current.
A 35-0-35V mains transformer fed from a Variac will allow you to reform in small increments until they either pass the leakage test, or fail due to excessive leakage.

BTW, all electrolytic manufacturers specify a reform cycle shortly before starting any testing/measurement of their capacitors.
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