Re: Electrolytic caps?
From: John Woodgate (jmw_at_jmwa.demon.contraspam.yuk)
Date: 02/26/05
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Date: Sat, 26 Feb 2005 22:12:16 +0000
I read in sci.electronics.design that Joerg <notthisjoergsch@removethisp
acbell.net> wrote (in <Kb6Ud.7462$OU1.5066@newssvr21.news.prodigy.com>)
about 'Electrolytic caps?', on Sat, 26 Feb 2005:
>Hello Watson,
>
>>Yes and yes, but it depends on how old those caps are. Over five years
>>old, and they're not 'fresh'; ten years and they're 'stale'.
>>
>>
>
>Nah. I have some 40+ year old radios where the electrolytic caps are
>just fine. A couple times I actually did a resistor charge and leakage
>test just to see. They were nearly as good as new.
>
>But sometimes when they had been in storage for decades they may have to
>be "formatted" slowly to get them used to the job of "being a capacitor"
>again.
It took a long time to discover that sodium chloride (common salt)
contamination was responsible for short life of aluminium electrolytic
capacitors, simply because traces of salt are almost everywhere. So if
your old caps have, by chance or design, a low salt content, they may
well still be good.
-- Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
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