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 the RV1, we regulate the gradation of voltage that we want.
R1=1K2 R6=10K D2-3-4-5=LED
R2-3-4=680R R7-8-9-10=1K IC1=LM324
R5=15K D1=5V6 /0.5W Zener RV1=10K trimmer
Source :: http://users.otenet.gr/~athsam/voltmeter_with_led_for_car_battery.htm
Related Links
More Circuit about LM324
More circuit about Volt Meter
More about testing car battery circuit
More about car voltmeter
More circuit LED Display
LED VU Meter by LM339
High impedance DC Voltmeter by IC CA3130
Level Detector by IC LM741
Low Battery Voltage Indicator by IC 8211
This entry was posted on Tuesday, June 5th, 2007 at 10:54 pm and is filed under Automotive, battery, meter.
