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 has a 100 dB dynamic We found it in a Popular Electronics from the 90s. Equivalent...
This 80's circuit uses a germanium transistor like the AC121. The circuit has an output...
May 2017 - Mouser Electronics already has inventory with ROHM BD570xx integrated circuits for...