Bargraph Led Battery Tester Circuit

Posted on Apr 9, 2012

The LM3914A bargraph LEDis used here as a voltmeter for battery testing. The circuit is powered by a 4.5-V battery and compares the battery under test with an internally derived reference, set by R1/R2/P1. Each LED of the 10 represent 10% of full scale.

Bargraph Led Battery Tester Circuit
Click here to download the full size of the above Circuit.

For best results, the battery (D.U.T.) should be loaded with an appropriate resistor.

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