Car power supply voltage monitoring circuit diagram

The car power supply voltage monitoring circuit is suitable for monitoring whether the car's power supply voltage of 12V is normal. If the power supply voltage is between 12V and 14.5V, it is normal; if it is lower than 12V or higher than 14.5V, there will be a light indication.

A1 and A2 are indicator light comparators, used when adjusting potentiometers W1 and W2. When the car's power supply voltage is greater than 14.5V, the B light is on; when it is less than 12V, the A light is on; normally both lights are off.