The LED car voltmeter (2)

  
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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) - schematic

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



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