This circuit was found in a 1967 General Electric documentation. The components are from that time. The load depends on the SCRs used.
Found in a 1990s US publication, this alarm circuit detects when a light beam is interrupted. Optical...
This circuit functions as a variable capacitor controlled by a potentiometer, multiplying the...
This simple circuit serves to identify the terminals of a PNP transistor. For NPN transistors, just invert...