geiger power supply circuit

Posted on Feb 7, 2014

This is a step by step guide to modifying the disposable camera flash unit that powers the Geiger tube in the last post. Geiger tube power supply hack using disposable camera flash unit Remove the flash tube and trigger transformer from the circuit board this can be done by gently squeezing the reflector assembly then pushing it carefully out of t

geiger power supply circuit
Click here to download the full size of the above Circuit.

he circuit board Reuse the capacitor from the trigger assembly as a output filter capacitor. Remove it from the board and place it across the traces from the bulk capacitor. This can be done by simply rotating the capacitor across to the nearest hole that is connected to the other leg of where the output capacitor was. (see image) oops another mistake, the switch S1 that is in the schematic is no longer there, it should just be a connection from the potentiometer to the base of the transistor) Carefully adjust the potentiometer to get an output that will power your Geiger tube. The Russian surplus SBM20 runs fine at 280-500V, so I chose to set my output to ~340VDC because at this level it draws less current from the batteries.

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