This circuit is suggested by General Electric in 1966 documentation. The Triac must match the engine. The resistors depend on the triac's sensitivity to firing.
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...