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 the basic configuration of an operational amplifier sample & hold circuit. The FET and...
This circuit can be found in other projects in this site. When S1 is open the circuit produces...
This well-crafted speed game setup for two competitors was found in a 1998 Poptronics. The circuit...