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In Reply to: RE: You can normally see noise with a..... posted by Cougar on March 16, 2016 at 07:35:34
Do you see more noise on a scope with the same diode model with a higher v or a rating. That is the question. Also thanks for the heads up on the break in thing. Good reminder. Tweaker
Follow Ups:
It's good practice to use diodes that are rated for ~3X or at most ~4X the voltage put out from the transformer, if using half-wave rectification. The voltage seen by the diode will be 1.414 times the max AC voltage seen at the transformer secondary with no load. (V is higher with no load.) In full-wave rectification, two diodes are in series, so it is very safe then to use diodes rated for only 2X the expected voltage from the transformer. My point earlier was more about current rating than about voltage rating. For this application, 100V or 120V diodes (no matter what type you choose) should be very safe.
you just need to do the experiment with the parts and scope. It may be very slight difference and one you may not even be able to hear. So don't stress on specs. If you can't measure it then just go with what sounds best to your ears! it's really not that big of a deal if the specs are slightly better or worse! Why worry about it? Pick one that was suggested and go with it.
Bigger or higher V rating doesn't always mean better, it will handle better and last longer due to a safe operation range. You need to get that thought out of your head, just because it may have been the case with some parts doesn't mean that's the golden rule! UF types sound like a good deal and you should try those.
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