The LED car voltmeter (2)

Published:2011/7/23 20:04:00 Author:qqtang | Keyword: car voltmeter | From:SeekIC

Here is to introduce the LED car voltmeter which is made of the op-amp LM312 and LED, it can display 6 gears of voltages, 10-15V, each gear is 1V.The working principle of the circuit The LED car voltmeter consists of the regulator circuit, Vref circuit, sampling voltage circuit and LED display drive circuit,see as figure 7-76. The regulator circuit consists of the 3-terminal regulator circuit IC, potentiometer RP and resistor R4.



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