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.
Operational amplifiers used in this 80's circuit is not very common today, but the setting can be...
This circuit has some differences from the conventional types of control in which the delay in the...
This circuit makes use of the LM11, 112 or 113 operatives and was found in a 1980s documentation. The...