Geiger counter

The Geiger tube needs a high voltage supply which consists of Ql and its associated components. The transformer is connected in reverse; the secondary is connected as a Hartley oscillator, and Rl provides base bias. Dl, D2, C4, and C5 comprise a voltage doubler
Geiger counter - schematic

RVl should be set so that each click heard is nice and clean because over a certain voltage range all that will be heard is a continuous buzz.

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