Bargraph Led Battery Tester Circuit

  
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 - schematic

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




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