Posted on Feb 7, 2014

The Geiger tube needs a high voltage sup-ply which consists of Q1 and its associated components. The transformer is connected in reverse; the secondary is connected as a Hartley oscillator, and RI provides base bias. Dl, D2, C4, and C5 comprise avoltage doubler. RV1 should be set so that each click heard is nice and clean because over a certain volt

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age range all that will be heard is a continuous buzz.

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