Found in 1970s General Electric documentation, this circuit uses period components to control a 12 V motor. Transistors support modern equivalents according to the controlled motor.
This circuit is from a 1980s Motorola documentation. The circuit can be made with modern...
This well-known circuit triggers a relay when light striking the phototransistor is cut off. The...
This circuit generates a pulsed tone whose frequency depends on C2 and whose flashing depends on...