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devmor
4 hours ago
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srean
4 hours ago
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Or an adapted Theremin
https://en.wikipedia.org/wiki/The_Thing_(listening_device)
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spyder
4 hours ago
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with a high speed camera any vibrating reflective object like a potato chips bag can become a weak microphone if you have line of sight even behind a soundproof window:
https://www.youtube.com/watch?v=FKXOucXB4a8
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