> I'll assume <= 1A since you're mentioning 7812's,
> > which *usually* are good to about 1A
> >
> Yep.

Tim, roughly what current do you need at 24V ? And how
tight does the 24V need to be ? If it's fairly small current
you can use a 555 or similar to drive a diode-capacitor
voltage doubler which will produce a little under 24V from
12V (because of diode drops). Possibly even a tripler if you
really actually need 24V and no less. And If it's over a few
10s of mA you'll have to consider something probably not
in the junk drawer, more than likely an oscillator + inductor

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