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For anyone else who may stumble upon this thread. Here is a more refined drawing of the circuit. Upon researching op-amps, it appears this is a differential (not differentiating) op amp circuit with an AC integrator and DC Gain Control. Thanks again for the assistance @std_match
Hello,
I am working on doing some reverse engineering on a circuit that uses a piezo element to 'sense' virbrations on a musical instrument and then computes whether the vibration matches the frequency of a predetermined pitch frequency.
I figured out most of the components on the base plate...
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