Hello edarring,
Perhaps you could try the RMS to DC converter shown below. It computes the RMS value of its input implicitly, using the same principle ADI puts in their analog RMS IC (for how it works, see my post:
A Poor Engineer's Distortion Analyzer). With the 2 V p-p input shown, the output reads 0.71 V as expected.
The circuit's attack and decay times are set by the lowpass filter, which we observe has an exponential decay -- making this RMS-DC converter suitable for level metering.
Best regards,
Bob