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Battery Level Indicator

2016-05-10 17:53  
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Abattery level indicator circuitis depicted in theschematic diagrambelow. This circuit is designed for 9V battery operation, as this circuit will start dimming below 7V and will be completely turned off at 6V.? If you want theLED indicatornot to dimming but just abruptly turns off at below 6V, then you can remove R3, and change R1 to 330k.

Battery Level Indicator circuit schematic

[Circuit's schematic diagram source: National Semiconductor Application Note]

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