Don't divert to an unrelated topic. If you take just about any 10 year old
capacitor out of a drawer (which was at voltage zero) the capacitance will
be within spec.
Capacitance changes over voltage happen with some ceramic capacitors, but
not to a significant degree with electrolytic.
ST
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On Thu, Jan 27, 2011 at 3:56 PM, AlienRelics <alienrelics@...> wrote:
I don't know what the failure mechanism might be. My conclusions aren't set
in stone, nor were they reached very scientifically.
Maybe the real problem is that if you replace caps in existing equipment
with higher voltage rating caps, they are larger and that puts them closer
to heat producing components around them and slows airflow patterns,
overheating the caps and causing early failure.
BTW, if that 400V rated aluminum electrolytic cap self-regulates down to
25V, the capacitance is going to change as the dielectric oxide layer gets
thinner. And I'd not count on it being the same thickness all over.
We disagree on whether or not ESD can do hidden damage to equipment, too.
And there is a lot of proof of that.
