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.
Found in a documentation by Hugo Gernsback from 1960, this receiver uses germanium transistors of the time...
Found in Popular Electronics, this circuit is intended for testing servos used in model making. The...
Following the American FCC rules, this 90s Radio Electronics circuit shows how to use a...