Re: [CAD_CAM_EDM_DRO] Re: Re: Power supply question.....

> On 22 Apr, CAD_CAM_EDM_DRO@yahoogroups.com wrote:
> >
> > have seen several pwr supply questions about caps....and it seems to me
> > that if they are being used as brute filter caps people are using way to
> > low a working voltage....in this case i would feel much better with a
> > 80-100v rating....and yes you can put them in parallel
>
> This not good advice for electrolytics.
>
> There is some charge thing that goes on related to the chemistry of an
> electrolytic cap, such that a cap used below its rated voltage loses
> capacitance, almost in direct proportion to the rated voltage / applied
> voltage.
>
> That is, a 100 volt electrolytic cap used at 50 volts will, within a
> short period of time, have only half the capacitance.
>
> Therefore, against all good engineering instincts, a person should use
> an electrolytic cap rated for a voltage as close as possible to the
> expected DC voltage.
>
> Alan
>
> --
>
> Alan Rothenbush | The Spartans do not ask the number of the
> Academic Computing Services | enemy, only where they are.
> Simon Fraser University |
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