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  1. @alonper So you've reported that LINE_IN...

    @alonper

    So you've reported that LINE_IN shorted to GND has no noise. What about the input to your preamp shorted to ground. We need to isolate if it's the preamp injecting the noise or the piezo....
  2. Okay weird. Based on chipaudette's link above...

    Okay weird. Based on chipaudette's link above from openaudio, my harmonic noise looks nearly identical to that blog post, even though I'm using a custom WM8731 board instead of the SGTL5000.

    I...
  3. I actually ran into a similar issue while...

    I actually ran into a similar issue while evaluating my custom made WM8731 board (so not using the Teensy Audio Board).

    I've got noise harmonics as well around 1khz fundamental though the lowest...
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