Voltmeter with LED for car battery PCB

Posted on Feb 5, 2014

The circuit, is a comparator, can measure with step of 1Volt, the voltage of battery of car. The clue of voltage become after comparison of voltage of battery, that is applied in the inverting inputs of amplifiers, with voltages of reference that are produced by a Zener D1, the value of which is such so that it present good thermic stability. With

Voltmeter with LED for car battery PCB
Click here to download the full size of the above Circuit.

the RV1, we regulate the gradation of voltage that we want. The optical clue become from four Led.

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