Using a 106 series SCR, this circuit was found in the May 1971 Radio Electronics magazine. The quiescent current is very low and is given by the value of R1.
This PWM circuit was found in an American publication from 1978. It consists of a simple control that...
This circuit, from an old ON Semiconductor publication, suggests a shield to excite an LED from an...
The integrated circuit used in this application is not currently common. The circuit is from 80s...