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 oscillator circuit with two transistors is from a 1965 documentation. The circuit is of the...
This circuit was obtained in an old documentation, but it is still current by the used components....
This guitar effect pedal was found in 1982 documentation. The circuit can be easily assembled with...