led 12 volt lead acid battery meter


Posted on Feb 6, 2014

In the circuit, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage is connected to each of the (+) inputs of the four comparators and the (-) inputs are connected to successive points along a voltage divider. The LEDs will illuminate when the voltage at the negative (-) input exceeds the reference voltage..


led 12 volt lead acid battery meter
Click here to download the full size of the above Circuit.




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