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More TestersBattery Monitor Circuits

Expanded Scale 12v Battery Voltage Monitor
January 17, 2011

Expanded Scale 12v Battery Voltage Monitor
The circuit below expands the battery voltage monitoring scale for a 12v battery so a more accurate voltage reading can be made.  The numbers printed onto the face of a standard 0v to 5v meter are changed so the scale ranges from 10v to 15v.

The circuit uses an operational Amplifier and a voltage regulator to perform the level shifting and rescaling of the battery voltage so the output varies from 0v to 5v with an input voltage of 10v to 15v.

Click on Drawing Below to view PDF version of Schematic

Battery Expanded Voltage Monitor designed by Dave Johnson

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