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In Reply to: RE: Which cap to upgrade first? posted by bruce.warren on November 29, 2007 at 13:48:26
If the original value is 5.0uf but the brand I want only has 4.7uf, is that a reasonable substitution? The manufacturer claims the cap is within 5%+/-. Or should I really push for 4.7% even if it means adding a bypass or trying a different brand?
I’ve read a few here who advise against wiring caps in parallel. A bypass seems a little different, but there is some disagreement there also, one even saying that a bypass adds an unnatural amount of air.
Thoughts here?
Follow Ups:
The differance between 5.0 and 4.7 is 6%. Your part tolerance in value is 5%, or the part itself may deviate in actual value from labled value by 5%. The differance between 6% and 5% is 1%. 1% is an insignificant figure. IOW for your purpose you may consider 5.0 or 4.7 to be identical in function = do not worry.
Almost every cap that I have measured has a higher capacitance than it is rated at - the % tolerance is almost certain to give you a higher value which will be close enough to your target value.
I guess technically speaking, you bypass inexpensive higher value electrolytics with a low value film/foil cap. But the wiring is still parallel.
As for the 5.0uFd vs. the 4.7uFd, you could probably get by with that substitution. But there shouldn't be a problem getting a .33uFd cap to parallel with the 4.7uFd to reach the desired value.
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