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 is suggested by Texas Instruments in his Optoelectronics Sourcebook. The transistors...
This well-crafted speed game setup for two competitors was found in a 1998 Poptronics. The circuit...
August 2016 - Mouser Electronics is already providing new MKR1000 Arduino board, a practical...