diyAudio (
-   Digital Line Level (
-   -   By-pass capacitor question (

rtate 15th December 2008 06:27 PM

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.

Mooly 16th December 2008 05:23 PM

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.

sharpi31 16th December 2008 05:59 PM

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)

rtate 17th December 2008 12:44 PM

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...

Mooly 17th December 2008 03:37 PM

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.

All times are GMT. The time now is 09:11 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 17.65%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio