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The LED car voltmeter (1)

2017-01-15 17:51  
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The LED car voltmeter (1)
Here is to introduce the LED car voltmeter which is made of the LM3914 display drive integrated circuit and LED, the display voltage range is 10.5V-15v, it can be used vehicles of 12V battery.The working principle of the circuit The LED car voltmeter consists of the display drive integrated circuit IC, point/line display mode selection switch S, resistors R1-R5, potentiometers of RP1 and RP2, diodes VD1-VD5, capacitors of C1 and C2, LED VL1-VL10, see as figure 7-75.