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Old 21st January 2013, 06:10 AM   #41
just another
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I'm not an engineer, but I would like to know how you calculated his input voltage when you do not know the regulation of the transformer or it's va rating

Tony.
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Old 21st January 2013, 07:04 AM   #42
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Forget it...
He has 50V capacitors now.
With his 50V capacitors he will now survive 357VAC over voltage to his transformer. :-)
Which is nice... :-)
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Old 21st January 2013, 08:00 AM   #43
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Quote:
Originally Posted by palstanturhin View Post
Forget it...
He has 50V capacitors now.
With his 50V capacitors he will now survive 357VAC over voltage to his transformer. :-)
Which is nice... :-)
He might survive wearing a tin hat but would the caps ?
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Old 21st January 2013, 08:50 AM   #44
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...And 375V with his amplifier connected...
Which is also - nice...
:-)


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Old 21st January 2013, 09:13 AM   #45
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The mind boggles how to make mountain out of a mole hill the OP stated the output voltage under the normal running conditions at 35V even in the unlikely event that it was measured at supply -6% the worst case would be supply +10 to get 40.9V well inside the the absolute maximum rating of the capacitor.
While I would have used 50Vdevices because they are common if I had 40V devices on hand I would have used them also. I and I would have done the trivial thing of measuring the mains voltage at which the output voltage was measured which could well have been 240V and saved 5 pages of speculation.
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Old 21st January 2013, 11:31 AM   #46
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Quote:
Originally Posted by metalsculptor View Post
..... and saved 5 pages of speculation.
hey, there's always something to learn

regarding cap lifetime
mentioned to might being shortened by the possible small over voltage
since he already have them, the weird thing is, his caps would actually last much shorter if put back on the shelf
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