High Voltage Power Supply without Transformer
Here we have a transformer-less high voltage power supply. It works only with a inductor (coil)
of 15mH. Granted, it only supplies a few micro amperes, but enough to supply a geiger müller tube.
With the zener diodes D5 - D12, one can adjust the output voltage. You can just use two
100V zeners and you get about 400V. Don't use your voltmeter directly, since the inner
resistance of the voltmeter is already too much, and the output voltage will drop
significantly. Use a voltage divider of 10 resistors with a min. of 10M each and measure the voltage
on the last resistor, which goes to ground on one pin. Now you can calculate the output
voltage.
For a little more current @ lower ripple and voltage drop use larger capacitors C3, C4, C5, e.g. 220n.
MicroCap student version Simulation:
Here is the MicroCap student version Circuit (ZIP file, 5k)
This is the simulation:
Green is the voltage at the inductor and the collector of T3.
Red is the high voltage output.
Last-Modified: Sun, 13 Apr 2008 21:56:08 GMT
Be very careful when handling high voltages!
cosmicrays.org cannot be held liable for damage of any sort!
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