The circuit of battery voltage monitor is fabricated and designed around op-amp IC LM709 configured as comparator. Where bi-color LED is used as indicator and indicates three voltage level state of a 12V battery. Resistor R1 with potentiometer VR1 is used as potential driver of voltage monitor circuit.
When voltage level rise above 13.5 volts, the output from IC1 goes low as a result LED begins to emit RED light. Similarly, when the voltage fall below a preset level (10Volts) the output goes high and the LED start to emit GREEN light. Resistors R3 and R4 is used as current limiter of LED.
..Read more http://electronicsproject.org/battery-voltage-monitor/
Resistors (all ¼-watt, ± 5% Carbon)
2 = 18 KΩ
R3, R4 = 680 Ω
VR1 = 10 KΩ (Potentiometer)
Semiconductors
IC1 = LM709
D1 = 1N4003
Miscellaneous
B1 = 12V Battery
LED = Bi-color LED
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