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 obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This project from a 1983 publication can be assembled using more modern transistors. We can use...
The circuit shown in the figure is the version activated at the low level, of the previous circuit...