[Amps] HV lytic max V ratings..some notes.

[Carl]

IMO the only rule is the heat rise.

If the ripple and ESR is low and the cap remains cool you can run it close 
to the max as long as turn on peak ratings arent exceeded. This also assumes 
spike suppression is used. I always use the very basic touch test to 
determine a caps ability.....after discharging of course.

I dont know if it still holds with some caps but they used to have a memory. 
IOW if run for a long spell (weeks, months) at say 60% of ratings and then 
run at max they had a tendency to fail.

Carl
KM1H


----- Original Message ----- 
From: "Carl Clawson" <carlclawson at verizon.net>
To: <amps at contesting.com>
Sent: Friday, April 09, 2010 9:48 PM
Subject: Re: [Amps] HV lytic max V ratings..some notes.


>
>
>> Somebody was asking abt how high you can safely operate a typ
>> 450 v lytic.
> ... don't run em over
>> 75%  of their V ratings.
>>
>> That's 75%  of the  working vdc..
>
> So, anyone know the technical definition of "working voltage" if it isn't
> the, um, voltage the capacitor can work at? Don't you just love
> specsmanship?
>
> Incidentally, I understand some electrolytics can be reformed to a higher
> working voltage if you apply a gradually increasing bias to them and then
> hold them for a while somewhat above the desired W.V.
>
> 73, Carl WS7L
>
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