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From: Robert Baer on 28 Feb 2010 05:09
Michael A. Terrell wrote:
> Bill Bowden wrote:
>> On Feb 26, 1:11 pm, "dcas...(a)krl.org" <dcas...(a)krl.org> wrote:
>>> On Feb 24, 11:29 pm, Bill Bowden <wrongaddr...(a)att.net> wrote:
>>>
>>>> Is it safe to operate an aluminum electrolytic cap at 10% reverse
>>>> voltage? The cap is 1000uF at 35 volts and charges with about 1 mA of
>>>> current at slow rates of 1 minute or less, and reaches 2 volts reverse
>>>> v on each half cycle. Seems to work ok, but I'm wondering about the
>>>> long term effects? I don't think there will be a heating problem with
>>>> only 1mA of current. Will the capacitance change over time?
>>>> -Bill
>>> I think you will be just fine, but would contact Spraque or another
>>> capacitor company if you want a better opinion. Could you put a diode
>>> in parallel with the capacitor?
>>>
>>> Dan
>> Yes, I thought about back to back caps with diodes in parallel to
>> block reverse voltage, but think I'll go ahead with the single cap to
>> see how it works out. There is a pot to adjust the RC time and may be
>> all that's needed if capacitance changes. Thanks for all the ideas.
>
>
> A reverse biased electrolytic is a diode. One of the first
> rectifiers was the 'Electrolytic Rectifier'.
>
Well, yes, but in some cases the cap acts like a poor diode..
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