The LED car voltmeter (2)

Posted on Feb 5, 2014

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 circui

The LED car voltmeter (2)
Click here to download the full size of the above Circuit.

t consists of the 3-terminal regulator circuit IC, potentiometer RP and resistor R4.

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