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Dave's Circuits
Circuits designed by David Johnson, P.E.

Master Category List - Dave's Circuits
Last Updated on: Monday, April 21, 2008 04:18 AM


Battery Monitor Circuits

Also see Circuit in DiscoverCircuits' Hobby Corner

9v Battery Voltage Monitor
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

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

Battery Monitor Circuits
Master Schematic Category List - David A. Johnson, P.E.
 

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