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.
The difference in this circuit, found in documentation from the 90s, is the use of a single...
This circuit generates pulses whose duration determines the position of a remote-control servo. The...
We find this circuit in 1975 documentation. The circuit can be used with other operational...