This circuit is from Radio Electronics from March 1977. The integrated circuit is from that time and the circuit is intended for an infrared audio link. The modulation is in pulse frequency.
In this 2001 circuit we have the way to trigger an SCR with a phototransistor. The circuit appears...
Found in an Electronic Engineering from the 80's, this circuit makes use of components of the...
Diodes Incorporated recently introduced a high performance PWM controller in Green mode for...