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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 ) |
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