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In Reply to: RE: Eli, would 600 piv be enough for most power supplies... posted by gkargreen on July 23, 2014 at 13:47:50
IF the Jolida amp uses a 4 diode bridge rectifier, 600 PIV Schottky diodes will be fine, from an electrical perspective. Remember my previous warning about mechanical issues! The size of xx4007 diodes is small, while TO220 cases are big.
Eli D.
Follow Ups:
In a full-wave bridge with capacitive input filter, lightly loaded (as it will be at turn-on), peak reverse voltage across a rectifier unit is 1.4 times the secondary RMS voltage. If the supply is delivering 400V under load, the secondary RMS is probably about 350-375V. The unloaded RMS will be higher. That implies a required rectifier PRV upwards of 550V, but that provides no safety margin for line variations and transients. I would not use less than 1KV PRV in each leg (or 2 x 600V series) for this application.
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Buy Chinese. Bury freedom.
wanted to know what the voltage value for the snubber caps should be , .01mfd @ ?wvdc, thanks!
"wanted to know what the voltage value for the snubber caps should be , .01mfd @ ?wvdc, thanks!"
I've only ever used ceramics for this, always rated at least 1KV. Being as Eli is recommending a different type cap, he's probably better qualified to answer your question.
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Buy Chinese. Bury freedom.
Ceramics aren't bad and many a part labeled for snubber service contains polypropylene, but Mr. Joppa (a man to heed) provided info. as to why polyester is better.FWIW, I'd like to see something greater than 1000 WVDC parts be used, even in an EL84/6BQ5 amp. However, a 1 KV rated polyester part probably will survive around "12" W. tubes. Remember, metalized film caps. are "self healing".
A quick search did not show any polyester dielectric parts rated above 1 KV. :> ( The "best" solution may be ceramic dielectric caps. in series with carbon comp. resistors.
edit: fixed typo
Eli D.
Edits: 07/25/14
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