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.
The circuit shown is based on the LM101A; diodes can be replaced with equivalents. Resistor R1...
With the disappearance of the light falling on the LDR, the relay closes its contacts by...
We find this circuit in an American 1980s documentation. Modern equivalent integrated circuits can be...