The purpose of this circuit is to measure the resistance of an antenna at the resonant frequency. The circuit is from an old American documentation for hams.
This oscillator version is from an RCA documentation from the 1970s. Transistors support modern...
This circuit is from a 1966 General Electric documentation. The circuit applies to sensitive SCRs for...
Suggested by an American documentation for 1969 neon lamps, this circuit provides SCR control with...