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.
The crystal frequency of this circuit found in an American documentation is limited only by the...
March 2017 - Texas Instruments' new TPS2H160-Q1 smart switches can now be obtained from Mouser...
Found in an English Maplin documentation from 1983, this circuit generates separate frequency...