AC voltmeter circuit

An operational amplifier, a diode bridge rectifier and DC mA AC voltmeter tables as shown in FIG. The figure, the operational amplifier LM324.
AC voltmeter circuit - schematic

Ul measured AC voltage is applied to the inverting terminal of the operational amplifier, it has a high input impedance, and because a negative feedback can reduce the feedback loop nonlinear effects, so the diode bridge and the head in the feedback operational amplifier circuit, in order to reduce the effect of non-linear diode itself. I all current flow path across the bridge, its value only Ui / R, related to nothing to do with the bridge and the head parameters (non-linear diode dead zone parameters). Table full head crossing rectified current is proportional to the average measured voltage of Ui. The measured voltage depends on the frequency band and the upper limit of the operational amplifier circuit of rising rates.

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