Precision Rectifier Schematic

[steadystate]

Is a schematic for the Positional Sensing Board (precision rectifier) available?

[steadystate]

Never mind, found it. New question: Has anyone tried a full wave rectifier instead of a half wave? If so, did it improve or degrade performance?

[dmitri]

The precision rectifier is a full wave rectifier.

[steadystate]

Are the feedback caps there for lowpass? To reduce high freq noise and/or false triggering at low thresholds? Stability? Just curious.

I've always wondered what frequency range of the piezo would be best to let through (or eliminate) to maximize sensitivity vs minimizing false triggering.

[dmitri]

The caps are there to reduce the high frequency noise but are not needed with better opamps.
The rectifier is needed only for positional sensing, it it doesn't make any difference for sensitivity or false triggering suppression.