Low cost and high sensitivity voltmeter circuit design

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The voltmeter is an instrument for measuring voltage. A common voltmeter-voltmeter symbol: V, there is a permanent magnet in the sensitive ammeter, and a coil composed of a wire is connected in series between the two terminals of the ammeter. It is placed 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. The voltmeter has three terminals, one negative terminal and 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 a low-cost, high-sensitivity voltmeter circuit.