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 is from an August 1984 Radio Electronics magazine. It monitors the state of a RAM...
Analog Devices suggests this circuit in documentation from the 1990s. The circuit is for 75-ohm...
This circuit, which can be built with several CMOS gates, was found in the March 1996 issue of...