Using 5 V relays, this circuit can be used as a control shield for microcontrollers. The circuit uses relays, and the motor voltage is independent of the control voltage.
This circuit was found in the February 1992 Radio Electronics magazine. The circuit drives 5 LEDs...
This circuit makes it possible to reverse the direction of a DC motor through a relay controlled by a...
This interesting radio circuit for listening on a crystal phone was found in a Japanese magazine in...