> http://www.pacificsun.ca/john/www/pdf-files/UVPower.pdf

Thanks for the circuit. A little more than what I expected, and
although I don't think I can use it for the current job, it'll be a
handy starting place for an EL backlighting project on hold

>  I'll see if I can find it and post the pertinant info.

That would be absolutely chipper if you could

> A switching supply will be far more efficent and use less
> components. I'm not sure that the capacitor multiplier circuit
> would have any less noise but perhaps some other expert
> can voice an opinion

Was thinking more along the lines of cheap "junk box" parts,
hence trialling a Cockroft-Walton type first. Efficiency isn't a
great concern, not so much as using a PIC and 5V for the
whole deal if possible

> that to make the voltage more stable

Using 317s for two reasons - (1) variable V outputs and
(2) able to use as current limiters. The voltages themselves
are pretty quiet, no 20kHz left that I can see. BTW, the "50us
TMR0 interrupt" was an error. It's of course 25us, 50us for
the whole cycle

> You could use the PIC isntead of the 555 to create the PWM signal

I've found the CW is very forgiving of mark:space ratio. Seems
anything greater than 25:75 will give the full output, even right
up to 99:1. Seems to be pretty good with square waves too,
although they are knocked out of shape a bit

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