Suppose I repurpose a handheld electronic flyswatter power supply as a high=
 voltage DC bias supply. These things generate over 600 volts from 3 volts =
using a circuit very similar to those in disposable camera xenon flashes(us=
es a transformer with three terminals on the primary, two on the secondary =
plus one transistor, one diode and a few resistors and capacitors).

But I want a lower, regulated output voltage, +-5 percent is fine.

How do I do this without drawing a lot of current? Even 1 mA at 500V is goi=
ng to consume gobs of juice. So no shunt regulators, either.

Can I get decent enough regulation by basing it on the flyback voltage in t=
he primary?

Any ideas would be welcome.

Thanks, Bob
--=20
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