saturation
Member
Yes, on resonance with other parts: if you use a function generator to generate the 40 kHz try adjust the output up or down to see if the buzzing disappears. Something in the frame could be resonating with a lower frequency harmonic, even if its a sine wave outputted, the actual output of the piezo could be distorted.
The buzz could be caused by an induced resonance of the support on which the piezo is mounted.
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