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Old 15th December 2008, 06:27 PM   #1
rtate is offline rtate  Canada
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Default By-pass capacitor question

When by-passing are there any benefits from using non-polar caps instead of regular polarized.

I am looking at some .47uf/50v black gates.
The pk series @ $.75 vs. the nx-hi-Q @ $1.95.
They are the same size physically and i don't mind spending the extra if there is some benefit to be had...

specifically when bypassing across op/amp power and larger filter caps in a cd/dvd player.
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Old 16th December 2008, 05:23 PM   #2
Mooly is online now Mooly  United Kingdom
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Non polar electroylitics are generally much worse than polarised with regard to ESR etc.
Values like 0.47ufd are easily available in poly types etc so the problem doesn't arise.
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Old 16th December 2008, 05:59 PM   #3
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I've tried bith types of BG and am confident that the Nx HiQ will be better than the PK (although nothing's certain...)

In my experience a nice MKP cap will beat either (and cost less)
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Old 17th December 2008, 12:44 PM   #4
rtate is offline rtate  Canada
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Further reading says that "black gates" don't like to be by-passed and the sound could be degraded even with film caps as by-pass...
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Old 17th December 2008, 03:37 PM   #5
Mooly is online now Mooly  United Kingdom
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As always you need to take measurements. It's quite possible for a cap that is inductive to become ineffective at some frequencies due to a resonance effect when bypassed by another small one. The same can be said of lead inductance or print inductance/resistance etc.
You have to design for the frequency range you are after targeting, which can be easier said than done sometimes.
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