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You can make a pop gun from firing capacitor into salt water in a large plastic syringe. The plunger will shoot out + hit the wall. Electrolysis of water for Hydrogen gas and fire same time. Insert 2 screws close together at the compression end of syringe with water. Keep the whole board. Use battery to run the charger circuit for the capacitor. (Use instead of lighting up a flash lamp.) Man from Philippines did this awhile back.. Another man discharged 500uf capacitor charged from several hundred volts supply, into mower engine spark plug. Salt water was put on end electrodes. When fired as electrolysis, it forms hydrogen gas and fires plug same time. His engine crankshaft turned over one revolution. Bench test was repeated. There are regular electrolytic caps and also whats called photo flash type which are called low ESR. These type discharge faster, less internal heating, and release more energy in one blast.
The Horvath US Patent showed how to run electrolysis cell on capacitor discharges which ended up as 30v + 200 pulse amps to electrodes in electrolyte, at 10khz.. Full schematic and parts list. Car ran on water.