Battery Monitor Circuits
Master Schematic Category List - David A. Johnson, P.E.
Monday, April 13, 2009
9v Battery Voltage Monitor using a LTC1440 Comparator
This circuit turns on a LED whenever the voltage of a standard 9v battery connected to the circuit drops below 7.2 volts. It uses a LTC1440 comparator, which also contains a 1.18v reference diode. In standby mode, the circuit draws only 4uA.
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