Hi Bob,

A combination of primary side regulation along with HV regulation
might work quite well.

I came up on this thread:
https://rimstar.org/science_electronics_projects/electric_fly_swatter_zappe=
r_racket.htm

If it is possible to increase the output power by changing the
resistor, decreasing it also would probably be fine.

Saw a discussion on EDN. goo.gl/6iN9wN
That could fire off some neurons. The BU508A is used in old CRT TV
set's can go up to about 700V

Cheers,
Manu
On Fri, Nov 16, 2018 at 9:43 AM Bob Blick <bobblick@outlook.com> wrote:
>
> Suppose I repurpose a handheld electronic flyswatter power supply as a hi=
gh voltage DC bias supply. These things generate over 600 volts from 3 volt=
s using a circuit very similar to those in disposable camera xenon flashes(=
uses a transformer with three terminals on the primary, two on the secondar=
y 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 g=
oing to consume gobs of juice. So no shunt regulators, either.
>
> Can I get decent enough regulation by basing it on the flyback voltage in=
 the primary?
>
> Any ideas would be welcome.
>
> Thanks, Bob
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