This circuit has the spark duration controlled by a 555 timer. The circuit was found in the 1990 special issue of Radio Electronics Experimenter magazine.
This circuit was found in an American publication from the 1980s. The circuit generates pulses from...
This circuit is from 1977 Radio Shack documentation. The frequency depends on the capacitor. The...
Found in a 1993 Electronics Experimenter Handbook, this circuit uses a multimeter to measure...