This thermal control circuit appeared in Radio Electronics magazine in October 1958. The circuit is powered by the power grid and has two sensors that operate in a differential mode.
This circuit with PUT is from a 1967 General Electric manual. The relay must have voltage...
This circuit was obtained in a 1974 magazine Radio Chassis Television, but as we can see by the...
Found in an Electronics World of 1966, this circuit makes use of FETs of the time. Modern...