This General Electric circuit produces pulses of light only when light stops shining on the sensor. Equivalent SCRs can be used and the trigger adjustment is done in a trimpot. The maximum load is 40W.
This power converter or inverter was found in a 1980s documentation. Transistors should be fitted...
This circuit consists of a constant current source for charging 12 V batteries. The charge is...
This diagram from a 1967 documentation shows how to switch high voltage neon lamps with 5V TTL...