At 12:10 PM 7/26/01 +0300, you wrote:
>I've done one, some time ago, see
>http://www.geocities.com/vsurducan/c520.htm
>at the bottom of the page, up to 150mA, but I don't recommend such power
>supplies for production devices ( maybe on 120V mains, only )
>Note that in my design, the supply don't like to remain without load...
>Vasile

If you use something like this (and I don't recommend it..) be sure to
put a resistor in series with the capacitor to reduce current surge and
in *parallel* with the capacitor .. because there is a good chance
if it is unplugged near the peak line voltage the capacitor may hold as
much as +/-300V charge .. that's enough energy in a 4.7uF cap to give
someone a goodly shock, and they can get it quite easily without
opening the case, if you see that?

Best regards,

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