12V Battery Charge Nominal Discharge (Low) Indicator Circuit
This circuit monitors car battery voltage. It provides an indication of nominal supply voltage as well as low or high voltage.
741 PIN CONFIGURATION
VR1 and VR2 adjust the point at which the red, yellow and yellow, green LEDs are on or off. For example the red LED comes on at 11V, and the green LED at 12V. The yellow LED is on between these values.