Tony,

To make it easy snag one of the surplus electronic flash units or
dismantle a disposable camera. Some of them are quite small.
An RC filter will clean up the DC and a simple resistor voltage
divider to cut the voltage to what you want. Regulation shouldn't be
a problem with a steady and low current draw.

To get the input current down it may help to swap the photoiflash
capacitor for something with very low leakage.

73,
Jim

On Wed, 10 Dec 2003 00:28:50 GMT, "KD7TOG"
wrote:

OK, here's a challenge to you guys ... I have been trying to ID a IC /
inductor combination to generate 150 to 200 VDC ... in the nano-microamp
range. I need to supply a bias voltage to an electrostatic microphone
element.

Any ideas ??

Wish list:

Very low current ... 2ma ;-)
Runs from 5 to 9 volt DC source
Minimal components

Most of the specs I find for HV units ( backlight supplies ) are too much
current. Most of the inductor type DC-DC converters seem geared towards low
voltage high current apps.

Will watch the discussion for tips and ideas ... all welcome.

Thanks

Tony, KD7TOG

( KD7TOG at earthlink dot net )