Driving VU Meters

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With a full-wave precision rectifier, the ground current is still distorted, which will require a separate ground from the audio path. I assumed you were only considering a half-wave precision rectifier, as they are less complex.

A full-wave precision rectifier also requires two op-amps. With my high sensitivity driver, both channels can be done with a TL072, while having a perfectly clean ground current.

Also, my drive circuit has a very high input impedance, something which an unbuffered PR also doesn't have.

The more op-amps you have, the more power you draw. It all adds up...
 
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