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Battery status indicator using op amps to comparate voltages with a reference (9volts source on the left with a voltage divisor). The 330ohm resistance is for tests with a 9volts battery, and the 51kohms resistance is for 1.5volts batteries test. The three led's show the bettery level, if the battery has complete charge, all 3 led's are on, if the battery has no full charge but it is so so ok, red and yellow led's are on and the green one is off, and when the battery has very low charge, only the red one led is on.
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