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 is a project that can easily be adapted for other purposes such as counting people, objects,...
A modulated (intermittent) siren, using the four gates of the 4001 integrated circuit is shown in the...
This circuit was found in July 1986 Radio Electronics magazine. The maximum current is 1.5 A. The...