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Old 18th November 2005, 04:15 PM   #11
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ah OK I see : transformer secondaries*square root(2) to have the secondary DC voltage.

With 34.5VDC no load, you agree that there is no particular problem using 40V caps. Caps can moreover handle nominal voltage*1.15 surges for a short time.
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Old 18th November 2005, 04:23 PM   #12
Nordic is offline Nordic  South Africa
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They might work for you to test your PSU etc... but they will have a shorter lifespan than usual by quite a factor. So you would want to get some decent onces at the earliest opportunity...

If you want to sell for a profit, sure go for it, but if its for you, don't cheat yourself with substandard stuff.
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Old 18th November 2005, 08:14 PM   #13
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Youyoung21147 have you thought about a separate case for the power supply? It need only to be as big as your caps and transformer. If it a toroid transformer you can fasten it to the side of the case.
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Old 18th November 2005, 08:24 PM   #14
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Yes, I am doing a separated shielded case for the PSU right now. It is long to build as I have not much time yet.

My problem is not place, but rather money : 40V caps can be almost two times less expensive !

According to the datasheet, they can live 100'000h at :

- 0.7 ripple current
- 40V nominal voltage
- 40C
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Old 18th November 2005, 09:38 PM   #15
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Zafira1981 have you tried a separate case for power supply?
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Old 18th November 2005, 10:33 PM   #16
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Quote:
Originally posted by jaudio
Zafira1981 have you tried a separate case for power supply?

Well, I have news.

I installed the siemens caps (20000x75v) and they really improved the bass response of the amp. I was using only 5000uF (1 for VCC and 1 for VEE).

i will not use the 20KuF caps because they're REALLY bigs, I 've looking for caps prices and i found 10000ufx50v at 3.672u$s each. so next week I will buy 4.

I dont want to buy a new case because they're expensive here... in argentina you have to multiply by 3 the prices. so each cap will cost like u$s11 each!!!


thanks!!!
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