phase & Bi-polar caps

PeteMcK · 10th May 2004, 06:36 AM

Dumb Q., but how do bi-polar caps affect the phase of a signal?

I remember it's possible to make a bi-polar by putting two polarised electros in series, but with the same two poles (say+) connected together; are commerical bi-polars just the same thing in a single package?

cheers,
Pete McK

Ouroboros · 10th May 2004, 07:15 AM

The phase shift will be the same as with any other cap of the same value.

Commercial bipolar electrolytics are formed so that there is an insulating interface layer between the foil and the electrolyte on both foil surfaces. The effect is indeed similar to two series-connected back-to-back electrolytics.

The problems with bipolar electrolytics are that the tolerance is poor, (and can vary as they get old), and that leakage can be high, although that is not usually an issue in crossover networks.

10th May 2004, 06:36 AM	#1
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	phase & Bi-polar caps Dumb Q., but how do bi-polar caps affect the phase of a signal? I remember it's possible to make a bi-polar by putting two polarised electros in series, but with the same two poles (say+) connected together; are commerical bi-polars just the same thing in a single package? cheers, Pete McK

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10th May 2004, 07:15 AM	#2
Ouroboros diyAudio Member Join Date: Dec 2003 Location: Nottingham UK	The phase shift will be the same as with any other cap of the same value. Commercial bipolar electrolytics are formed so that there is an insulating interface layer between the foil and the electrolyte on both foil surfaces. The effect is indeed similar to two series-connected back-to-back electrolytics. The problems with bipolar electrolytics are that the tolerance is poor, (and can vary as they get old), and that leakage can be high, although that is not usually an issue in crossover networks.

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