angus.oliver@[EMAIL PROTECTED]
wrote:
> Hi all,
>
> The subject describes pretty much my question. I have been spending
> several days trying to debug a circuit, only to find that it wasn't my
> fault:
>
> I have a normal (pretty cheap) switch-mode plug-pack power supply
> (240V, 50Hz in; 12V, 200mA out), and nominal voltage appears to be
> somewhere around 12V (so far so good). With an electrolytic cap across
> the output (correctly polarised), the voltage rises to somewhere
> around 17V - 18V. I had no idea this would occur, and was thus trying
> to find the problem in my circuit.
>
> Does anyone know why this happens? Presumerably a poor regulating
> circuit in the plug pack, but does anyone have some more thorough
> answers?
>
> Thanks very much,
>
> -Gus
its simple, You don't have a switch mode power supply..
Its your basic all wart type supply that is unfiltered or
you have something serious wrong with the supply.
http://webpages.charter.net/jamie_5"
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