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Hi all, could I have a little help please. I've got an application
that amongst other things requires a variable voltage from
10V to 20V. It's to charge a large cap for a solenoid pulser.
I've got this voltager quadrupler circuit that I could drive with
5V PWM from a PIC pin. The multiplier may not get to 20V,
but 15V or more should hopefully be enough

Questions -

How do I select the capacitors for best efficiency at a
particular frequency. Ripple is not especially important,
neither is frequency ?

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

Do I need a load R apart from the solenoid reservoir cap ?

What possible down sides are there for the PIC ?

TIA


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