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Replying to @SianaGearz and @fpgahelper

This could be the way! Test pads make for a minuscule PCB footprint, and I can direct drive a piezo from the DAC pins. There might just be room in the enclosure for something like this: https://www.digikey.com/en/products/detail/db-unlimited/P08080-1/9990567 (tho I’ll have to learn some things about springs…)

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