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3-digit common anode display digital voltmeter circuit design
The voltmeter is an instrument for measuring voltage. The common voltmeter-voltmeter symbol: V, there is a permanent magnet in the sensitive ammeter, and a coil composed of wires is connected in series between the two terminals of the ammeter. In the magnetic field of the permanent magnet, and connected to the pointer of the watch through the transmission. Most voltmeters are divided into two ranges. (0—3V) (0—15V), the voltmeter has three terminals, one negative terminal, two positive terminals, the positive pole of the voltmeter is connected to the positive pole of the circuit, and the negative pole is connected to the negative pole of the circuit. The voltmeter is a fairly large resistor and ideally considered to be an open circuit. The figure shows the design of a 3-digit common anode display digital voltmeter circuit.