Blow Those Pyros With A Telephone!

A hobbyist project using the ringer crank generator from an old military field telephone to fire pyrotechnic charges. The generator charges a capacitor bank through a bridge rectifier, with a thyristor acting as the trigger to dump the stored charge through the pyro filament. The circuit includes a charge indicator using Zener diodes and an LED, plus a safe filament tester powered by a 9V battery. The project highlights how analog discrete components like bridge rectifiers and thyristors have become rare, with modern equivalents likely using microcontrollers and off-the-shelf inverter modules.

Source: https://hackaday.com/2026/08/25/blow-those-pyros-with-a-telephone. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.