> I've seen circuits for very simple, efficient, transformerless,
> non-isolated power supplies such as
> http://www.aaroncake.net/circuits/supply5.htm .

Note that the explanation states: "You may want to add a resisor in
series with C1 to limit current if the circuit is plugged in and the
mains is at its full voltage." I don't see how you could avoid plugging
in at the top voltage, so that resistor definitely belongs in the
circuit.

The other problem with this type of circuit is the voltage on the mains
plug after uplugging...

Wouter van Ooijen

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