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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, November 17, 2017 06:32 AM

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More  Battery Monitor Circuits

9v Battery Voltage Monitor - July 9, 2006
 

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.

Click on Drawing Below to view PDF version of Schematic

Circuit 9V Battery Voltage Monitor Circuit using a LTC1440 comparator designed by David Johnson, P.E. (June 30, 2006)

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