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I just re-tested the schematic posted above and the results were more encouraging. In the initial test, my laptop audio outputs weren't turned up all the way. Sure enough, the results improved with the output higher. Though the low speed output from the sensor is a bit low voltage, so that may be a concern.
The output is much closer to a square wave. However, at lower hz, I am getting sloped peaks, not flat. I guess I'll have to drive it with the actual sensor and record it again.
The square wave output is still very much a/c. Should I try and sink the negative component with a diode? Or is the zener in the MPG circuit going to take care of that?
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