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DC, RMS, And Peak-to-Peak High Impedance Voltmeter

2015-01-14 04:37  
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Analog meter normally doesn’t have high impedance since they don’t have buffer circuit inside. With active buffering, the input impedance of this circuit depends on the impedance of the op-amp.

DC RMS PEAK TO PEAK High Impedance Voltmeter circuit schematic diagramYou can use other op-amp for higher impedance, but a low-cost 741 is enough for may application. The rectification inside the feedback loop path remove the effect of diode’s voltage drops, and now the RMS and peak-to-peak conversion is simply a matter of division process in relation to DC reading. [Circuit's schematic diagram source: electronicsforu.com]

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