This LED diode test is suggested by the Texas Instruments optoelectronics manual. The transformer current can be between 50 mA and 300 mA and the voltage between 6 and 9 V.
This symmetrical power supply uses regulators from the 78xx and 79xx series and can be adapted to supply...
Found in a Radio Electronics from the 90s, this circuit generates a 1 kHz signal to serve as a...
This circuit activates an incandescent lamp at dusk and goes out at dawn. The sensor is an LDR and...