Date: Mon, 8 Oct 2007 12:02:56 -0400
From: wdonzelli at
gmail.com
To: cctalk at
classiccmp.org
Subject: Re: reforming capacitor tutorial/walkthrough
Has anyone got one online? If so, URLs please...
It has mostly been a lot of smoke and no fire, actually.
Actually, no smoke, either.
Amongst the serious electronics restoration and repair folks I deal
with, reforming caps is pretty much a waste of time. The only
electrolytic caps that seem to really require careful handling are
those made prior to 1950 - the kinds that we never encounter.
---snip---
Hi
I still think it is worth doing. The problem I've seen
is that the capacitor had been powered up too fast some
time in the past and had broken the burst seal.
It most likely hadn't failed at the time, just outgassed
some. Later, no amount of reforming would have saved
it.
Although, like you, I don't always reform, it still has some
value.
I'd suspect there should be some type of current limit per
volume of capacitor that one should follow. I've just made
guesses but I'd guess someone should determine a rule
of thumb.
For a typical large filter caps, I use a limit of about 10
ma. This seems to work well.
There is nothing that can be done for dry tantalums.
They can't be reformed.
Dwight
Dwight
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