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.
The circuit presented was suggested by a Texas Instruments optoelectronics manual. The voltage...
This cassette player motor speed control was found in the January 1991 issue of Radio Electronics...
This is an old circuit with a homemade sensor found in the September 1995 Electronics Now...