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.
We found this circuit in the 1960 Mullard transistor reference manual. The phototransistor can be a...
This simple circuit was found in an old documentation. The transistor can be changed according to the...
This circuit was found in an 80's Electronic Engineering. The power supply must be symmetrical. The...