This low power circuit for the FM band was found in a spy book from the 90s. The tunnel diode is not an easy component to obtain and the power can be supplied with a single button cell.
This circuit was proposed by a 1965 Electronic Design. Its purpose is to widen the line transients...
The input of this regulator can be between 7 and 12 V and the output is 5 V. The circuit is from...
This circuit was found in the December 1983 issue of Radio Electronics magazine. The sensor is an...