I’ve started building this wonderful piezo amp using the schematics and instructions from this great site .
Unfortunately, I still use really bad cables (I thought using a USB cable with cut-off plugs would be a cheap way to get a still well shielded cable. It’s not :/.). Find below the recordings, denoised with a 50 Hz + harmonics notch filter.
Sand:
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Sand2:
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Table:
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Water:
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Keyboard:
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