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 from March 1984 Radio Electronics is intended to allow the use of an oscilloscope to measure...
The circuit in the figure uses the four current amplifiers of the LM3900 to generate a sawtooth signal...
This amplifier was found in a technical documentation from the 1970s. The circuit uses 2N2218...