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 obtained in an American documentation from the 90's. The circuit can be...
Although the integrated used originally is uncommon today, more modern operating equivalents can...
This circuit is designed to measure very weak currents, in the order of picoamperes. We found it...