This circuit acts on a relay disconnecting the load when the input voltage exceeds the set limit. The transformer is 12 V secondary according to the relay used.
This control for a traffic light with incandescent lamps was obtained from an English...
This circuit can be powered by 2 or 3 small batteries. The resistor can have values between 220...
This circuit uses three flip-flops and two NAND ports to obtain a frequency division by 5,...