This circuit was found in a 1967 General Electric manual. It is intended for the control of high voltage Nixie pipes used at the time. SCRs may be equivalent.
This shield circuit, from a documentation from the 70s, employs an optocoupler with two SCRs to...
The integrated circuit used in this application is not very common. Transistors and resistors...
This circuit incorporates a thermostat. The circuit is from Motorola's Linear Interface ICs from...