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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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More  Battery Monitor Circuits

9v Battery Voltage Monitor using a LTC1440 Comparator
(June 30, 2006)
 

Nine voltage batteries are used in a wide variety of electronic devices.  But, you often donít 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.  This hobby circuit is designed to turn on a LED indicator light when the battery voltage drops below 7.2 volts.

Click on Circuit Below to view PDF of Schematic

9V Battery Voltahe Monitor, David A. Johnson, P.E., June 30, 2006

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