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.
When the light falling on the sensor is cut off, the SCR fires, powering the lamp. Remember that...
We found this circuit in Radio Electronics from October 1968. The circuit drives headlight bulbs...
This 8.2 V voltage reference was found in a 1968 Electronic Design. The op amp is from the time,...