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OK to have different values on caps in a CRC PSU?
OK to have different values on caps in a CRC PSU?
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Old 4th October 2018, 08:28 PM   #1
Hubba is offline Hubba  Sweden
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Join Date: Feb 2007
Location: Östergötland
Default OK to have different values on caps in a CRC PSU?

So, i'm about to start on my second F5 amp. I've got two huge 33000 uF and a couple of 15000 uF caps which I would like to use, so my simple Q is:

Standard F5 psu (CRC) states min 30000 uF per rail, and I would like to mix 33000 and 15000 uF caps and I just would like to get it confirmed that it will not be a problem. (I reasoning the more uF per rail the better, and I got the parts..)

The total uF per rail will of course be the same (i.e 1x33000 + 3x15000)

Thanks,
Fredrik
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Old 4th October 2018, 08:58 PM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by Hubba View Post
Standard F5 psu (CRC) states min 30000 uF per rail, and I would like
to mix 33000 and 15000 uF caps
That will work in this case, but for high ripple current applications
the capacitors should all be the same so they will heat equally.
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Old 5th October 2018, 07:18 AM   #3
Vovk Z is offline Vovk Z  Ukraine
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Quote:
Originally Posted by rayma View Post
That will work in this case, but for high ripple current applications the capacitors should all be the same so they will heat equally.
"F5" - I guess it is Nelson Pass F5 First Watt amp: Output power stereo 8 ohms 25 watts @ 1% THD, 1KHz. Here is a link to pdf.
So, it doesn't need very high ripple current. I think there isn't problem with current sharing.

Last edited by Vovk Z; 5th October 2018 at 07:24 AM.
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Old 5th October 2018, 07:22 AM   #4
Vovk Z is offline Vovk Z  Ukraine
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Join Date: Oct 2011
Location: Kyiv
Quote:
Originally Posted by Hubba View Post
Standard F5 psu (CRC) states min 30000 uF per rail, and I would like to mix 33000 and 15000 uF caps and
I think it may be a little better to start CRC with lower value (15000 uF) and end with larger value (33000 uF).

I put a picture to help people.
OK to have different values on caps in a CRC PSU?-f5-fw-ps-png
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File Type: png F5-FW-PS.png (252.1 KB, 66 views)

Last edited by Vovk Z; 5th October 2018 at 07:30 AM.
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