Re: Electrolytic caps?
From: mc (mc_no_spam_at_uga.edu)
Date: 02/27/05
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Date: Sat, 26 Feb 2005 23:06:09 -0500
"Tim Wescott" <tim@wescottnospamdesign.com> wrote in message
news:1121vm3s9fi6a0b@corp.supernews.com...
> Its "forming" (technically "reforming" since it was already done once at
> the factory long long ago). You can do a web search on electrolytic
> forming.
>
> Basically you feed it rated voltage through a big current limiting
> resistor -- what you're doing is restoring the aluminum oxide layer on the
> foil. There are a number of techniques for verifying that the forming is
> complete (vs. the cap being bad) -- basically when you think you're done
> you test with more than the rated voltage to see if the thing leaks -- if
> so, you scrap it.
>
> I've never done it, but it's a common thing with tube-equipped boat
> anchors.
The way I do it, which I thought was standard, was to gradually raise the
voltage from zero over a period of minutes, monitoring for leakage all the
time, and then leave it charged to the rated voltage for some time.
You can measure quite an increase in capacitance from doing this, even if
the capacitor didn't test out as defective to begin with.
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