> ICL7660-type voltage inverter) you can get efficiencies
> approaching 100%.

Sorry, I skipped ahead of myself in the previous reply and
read that for this circuit I won't get 100% efficiency

>Will varying the M:S ratio of the signal produce a variable
>DC at the output of the multiplier ?

This variable voltage has another application apart from
charging the solenoid cap btw

> Nope

What I'm thinking then for the variable voltage part of it is to
drive the multiplier with a 50% square wave and get what I
can in the way of voltage (V++). Take V++ through a series-
pass PNP into an RC filter. The base of the PNP will have a
pull-up to V++ and an NPN to ground, controlled by a 2nd
PWM from the PIC. Sound feasible ?

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