Hand-Crank Geiger Counter

Charge a high voltage tube using a simple mechanical oscillator.

Written by John Iovine

I like mechanical systems. Even when it's not the most efficient solution, a machine with moving parts has flair that electronics often lack.

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Gregory Hayes

HOW THE ELECTRONICS WORK

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» The circuit applies 18V (from two 9V batteries wired in series) to the primary windings of the step-up transformer through the saw switch.

» The on-off cycling of power to the transformer creates inductive high voltage in the secondary winding, which passes ...

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