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Last Updated on:  06/19/2009 03:05:04 PM

9v Battery Voltage Monitor
designed by David Johnson, P.E.
Nine voltage batteries are used in a wide variety of electronic devices.  But, you often don’t know when it is time to change the battery until the device stops operating.  The hobby circuit below provides a visual indication when the battery needs to be replaced.  It uses a neat IC from Linear Technology, which contains a very low power voltage reference and a voltage comparator.  The circuit is designed to turn on a LED indicator light when the battery voltage drops below 7.2 volts.

Click on Schematic below to view PDF version of this Circuit

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