The resistors R1 and R2 consist of 8 220 ohms x 2 W resistors connected in parallel. The dissipation must be higher for high transmitter power. The indicator can be the multimeter.
This circuit was found in an American documentation from 1968. The configuration can be adapted to...
This circuit is interrupted when S1 is pressed. The frequency is given by C1, which can be...
The circuit presented is from the 1977’s Linear Integrated Circuits and MOSFETs from RCA. The...