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 circuit behaves like a capacitor whose value is C1 multiplied by the relationship between R1 and...
This circuit of an old 1968 magazine aims to synchronize a slide projector with a recording, but...
This switching power supply was found in an Electronic Design from the 90s. The components are...