Re: [MLUG] 2000pf 6.3vt Electrolytic Caps

[Mark Rages <EMAIL:PROTECTED>]

On Tue, Jul 06, 2004 at 02:03:51PM -0500, Spurling, Shannon wrote:
> I believe all electrolytic caps are polarized. Just be aware of how you
> connect them, and make sure they get put in the same way as the ones you
> removed. 
> Some polyester caps are polarized, but most other types aren't. It's
> because of the internal structure of the capacitor. I don't believe a
> electrolytic can be non-polar.
> 

Wrong, there are non-polar electrolytics.  Commonly found in speaker 
crossovers.  They are more expensive and larger for their capacity.

And I don't believe polyesters are polarized.  But sometimes the outer 
layer of a film capacitor is marked.  In the old days of paper caps and 
vacuum tube B+ voltages, you wanted the outer film to be nearer ground 
potential.

Bob Pease's "Troubleshooting Analog Circuits" has an excellent first 
chapter on the properties of various components:
http://www.national.com/rap/Book/0,1565,0,00.html

P.S.  No one has recommended Digi-Key as a supplier?  One of the best 
"e-commerce" websites I've ever seen.

Regards,
Mark
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-- 
You think that it is a secret, but it never has been one.
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