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In Reply to: RE: recommended replacement for 1N4007 diodes.. posted by gkargreen on July 21, 2014 at 19:55:39
Parallel the capacitor. Use a mylar cap, because it is a low-quality material and has some ESR at high (recovery spike) frequencies. If you must use a high quality cap, put a resistor in series with it, preferably a quality carbon composition - you need resistance not inductance. The snubber must dissipate energy, not just re-direct it, so it must have some resistance.
Follow Ups:
thanks, Paul, so those little yellow caps should do the trick, correct?
I don't know about the rest of you, but I have a real hard time determining the type of insulation film being used from the color of the paint applied to a cap.
OK, I'm just being silly here. But you still have to be more specific if you want a useful answer. Mylar is technically a brand name for a polyester film - both terms are used.
Ceramic caps (for example), which have very little resistance even at very high frequencies, would be the wrong type for this application.
PJ,
High WVDC polyester film caps. are PRICEY. Ceramic caps. in series with carbon comp. resistors may be the best practical solution.
Eli D.
What value resisters would you use?
Thanks
Cleet
I don't know about the rest of you, but I have a real hard time determining the type of insulation film being used from the color of the paint applied to a cap.
OK, I'm just being silly here. But you still have to be more specific if you want a useful answer. Mylar is technically a brand name for a polyester film - both terms are used.
yes, I was just referring to the cheap plastic barrel caps I get at my radio club, I don't see a makers mark, but they look like those cheap Illinois caps...
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