The selected circuit was found in GE's 1977 semiconductor manual. 3N84 is a controlled silicon switch and SCRs support equivalents. The transistor can be a BC558, depending on the supply voltage.
This circuit, which can be used as a shield for microcontrollers, provides 50% active cycle output...
We found this circuit in a 1968 General Electric publication. The circuit uses an SCR of the time,...
This circuit allows the division of the frequency generated by an oscillator with the 4069 by two,...