This Battery Charge-Discharge Indicator Circuit Diagram monitors car battery voltage. It provides an indication of nominal supply voltage as well as low or high voltage. RV1 and RV2 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.
Battery Charge-Discharge Indicator Circuit Diagram
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