In this circuit we have the way to use two transistors as a regenerative pair simulating an SCR. The circuit is from a 1965 General Electric documentation.
We found this multiple thermostat circuit in July 1980 Radio Electronics magazine. It uses...
This circuit is from a 1986 Revista Española de Electrónica. It consists of an amplifier with...
Suggested by a 1968 Philips documentation this Eccles Jordan rocker as it was called can operate...