[NJARC] non-Polarized Capacitors

[Al Klase]

Nick's right.  The commercial non-polarized electrolytics amount to 
being back to back polarized units, and that makes an acceptable 
substitute.  However, in my limited experience rebuilding vintage 
speakers, the years have not been kind to these things.  They change 
value significantly with age, and in speakers, especially a stereo pair, 
this has audible implications.

There are high value, 2.3, 4.7, 10, 22 uF, metalized polyester caps 
floating around that can be series-paralleled to get you where you need 
to be, and their values should remain constant for many decades.

Let me know what you need, and I'll rifle through the boxes.

Al

NICHOLAS SENKER wrote:
> Just remember 
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> _________________________________________________________
> For John Rucollo and Steve Colandra; we were discussing non-polarized caps for speaker crossovers; these are available commercially and I think I have some; will bring them to the swapmeet.
> According to my Popular Science 'How to build your own Radio and Hi-Fi' manual; you can make your own non-polarized caps by connecting two regular electolytics 'back-to-back'.  Connect the negative leads together and use the positive leads for speaker connections.
> For a 2000 hz crossover at 8 ohms, you need a 10 mfd cap but if you put two caps in series as above you need twice the capacitance; in this case, 20 mfd each.
> Nick Senker 
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/