[NJARC] non-Polarized Capacitors

[w2wiq1 at juno.com]

HI ALL:

IN INFORMATIVE ARTICLE ON CROSSOVERS.

http://www.chokes.com/crossovers_explained.html

WALTER-W2WIQ

---------- Original Message ----------
From: "Ray Chase" <raydio862 at verizon.net>
To: "Al Klase" <al at ar88.net>,	"NICHOLAS SENKER" <ns539 at embarqmail.com>
Cc: njarc at mailman.qth.net
Subject: Re: [NJARC] non-Polarized Capacitors
Date: Mon, 19 Oct 2009 09:04:36 -0400

Just remember 
Reply = Poster
Reply All = Everyone

_________________________________________________________
I too would be concerned about the stability, accuracy and longevity of 
electrolytics in a non-filtering critical value application.  But what about 
oil filled units? They should be stable, have long life and space should not 
be a problem in large speaker applications.  I have a large stock and have 
seen them go begging at ham fleas.  If you need a critical value, trim out a 
parallel set up with lower value poyester units.
Ray
----- Original Message ----- 
From: "Al Klase" <al at ar88.net>
To: "NICHOLAS SENKER" <ns539 at embarqmail.com>
Cc: <njarc at mailman.qth.net>
Sent: Sunday, October 18, 2009 3:38 PM
Subject: Re: [NJARC] non-Polarized Capacitors


> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
> 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
>> Reply = Poster
>> Reply All = Everyone
>>
>> _________________________________________________________
>> 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/
>
> ______________________________________________________________
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