Schematics Depot >> Power >> 12v "high" or "low" battery monitor

12v "high" or "low" battery monitor:

U1LM741 op amp IC
R1100k ohm potentiometer
R2, R310k ohm resistor
R4330 ohm resistor
LED1light emitting diode

all resistors are 5 or 10 percent tolerance, 1/4-watt
R1 controls the trip-point of the circuit. adjust it accordingly. to reverse the logic (have the led light up when the battery has at least X amount of power,) connect the led to ground through R4.
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