Electronic Circuits and Diagram-Electronics Projects and Design

In all electronic voltmeter circuits the principle involved is that an indication on a permanent magnet moving coil instrument (normally abbreviated as PMMC or D’Arsonval movement) proportional to the input voltage is obtained by means of amplification in one or more stages with a high input impedance. Although electronic instruments are usually more costlier than electrical instruments but are becoming more and more popular because of their numerous advantages over conventional ones, as discussed below : A moving coil voltmeter draws a large current, hence a large power from the test circuit during measurement. Generally current drawn by the voltmeter…