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.
We can obtain a monostable circuit with two amplifiers, from the configuration shown in the...
This speaker overload protection circuit was found in Radio Electronics from the 1980s. The...
This circuit shuts down a three-phase motor in the event of missing one or two phases, thus...