This countdown electromagnetic ring launcher was found in an Electronic Hobbyst Handbook from 1993. The components can be difficult to obtain. Details of the launch coil were not given.
S1 changes the selection of the input signals in the circuit shown here. Other type of circuits,...
This circuit provides a reference voltage for calibration. He uses a diode in a small thermal...
For experiments with ionization chambers and Geiger valves this circuit generates high voltage from...