This design is a voltmeter based on the analog-to-digital conversion chip ICL7107

ICL7107 is an analog-to-digital conversion chip with high precision;

segment code output, which can directly drive the digital tube without any program

This project mainly includes ICL7107 drive circuit, four common anode digital tube circuits, etc.

5V power supply, the voltage to be measured is connected through another terminal

When using for the first time, you need to confirm the position of the decimal point,

just confirm the position of the jumper cap.

The adjustable resistance is used to accurately adjust the display of the digital tube against the voltmeter.

The button is the test function. Will all be cleared