[Lindsay] has a wonderful writeup about a new toy in the shop, an ultrasonic transducer. The 28kHz, 70W bolt-clamped Langevin transducer by itself is not much use, you need a power supply ...

The transducer is then simply placed on the metal shelf. The two piezo pickups are placed on either end of the shelf, with one going to the right channel of one input, the other going to the left ...

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Piezo-electret film as an acceleration sensor At the core of this technology is a piezo-electret transducer in the form of an inconspicuous, flexible polypropylene film that serves as a sensor.