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From: jwp@larry.sal.wisc.edu (Jeffrey W Percival)
Newsgroups: sci.electronics
Subject: Capacitor questions
Keywords: electrolytic capacitors
Message-ID: <109@cupcake.sal.wisc.edu>
Date: 3 Nov 89 01:43:27 GMT
Organization: Space Astronomy Lab, Madison WI
Lines: 35

I am getting a B/W TV back into working order, and want to replace a
few capacitors.  Being a novice at this (astronomy, not EE), I have
some questions after reading through a parts catalog.

My TV parts list gives a capacitance and voltage for each capacitor.
The parts catalog (Digi-Key Corp.) lists many capacitors, but not
always of the exact value I need.  So, how do I choose?  Always go to
the next higher voltage rating?  Thence to the next higher
capacitance?  Does it depend on what role the cap is playing in the
circuit?

Example:  I need a 15V, 5uF cap.  The catalog has this:

	voltage	capacitance
	6.3	47
	6.3	100
	6.3	220
	10	22
	10	33
	10	47
	16	10
	16	22
	16	33
	16	47
	25	3.3
	25	4.7
	25	10
	25	22

Do I go all the way up to 25 volts to get the 4.7uF?  Or do I
simply find a better catalog?  Do caps come so finely graded?

Another question:  does "bi-polar" mean the same as "non-polarized"?
-- 
-Jeffrey W Percival (jwp@larry.sal.wisc.edu) (608)262-8686