Hand-Crank Geiger Counter
Charge a high voltage tube using a simple mechanical oscillator.
I like mechanical systems. Even when it's not the most efficient solution, a machine with moving parts has flair that electronics often lack.
HOW THE ELECTRONICS WORK
» 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 ...