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 is a circuit that should not be used for readers interested in a fair game. The circuit...
This interesting idea was obtained in a 1982 documentation and can be used for special effects in...
We found this circuit in an old publication from Argentina. The relay must be of the sensitive type,...