Yapp, thank's for the point, I knew it ( it's more than 300V, it's 316V
usual and much more on spikes or mains failure ) but this one was intend to work
plugin forever , and exactly like this is working continuously from about
two years...with same capacitor.
But needs a VERY GOOD capacitor and I must admit, I had search something
for it. (any cap or xcap like you named it, who make a delicate noise,
almost imperceptible, will die soon )
About the current surge, you have right, there is a series resistor  which
seems is missing in the picture.
Vasile

On Thu, 26 Jul 2001, Spehro Pefhany wrote:

> 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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> Spehro Pefhany --"it's the network..."            "The Journey is the reward"
> speff@interlog.com             Info for manufacturers: http://www.trexon.com
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