How to make over under voltage protection circuit

How to make over under voltage protection relay Hi friends in this video i have made an over under voltage protection circuit this circuit can be used for both ac and dc load you can set over voltage and under voltage limit when voltage goes above the over voltage limit or goes down the under voltage limit the relay turns off hope this video would be useful please like share and subscribe Components: 1x LM393 IC 1x BC547 TRANSISTOR 1x BC557 TRANSISTOR 2x 5K VARIABLE RESISTORS 4x 1N4007 DIODES 1x 3V ZENER DIODE 3x LEDs ( RED, GREEN AND YELLOW ) 5x 1K RESISTORS 3x 4.7K RESISTORS 2x 10K RESISTORS 1x 12V RELAY 2x 2 PIN TERMINAL BLOCK 1x 3 PIN TERMINAL BLOCK VERO BOARD JUMPER WIRES Circuit Diagram: https://drive.google.com/open?id=13tV... https://drive.google.com/open?id=1p0t... Previous Videos:    • How to make 100W Stereo Amplifier      • LET'S REPAIR IT | BENQ PROJECTOR      • Let's Answer Your Questions