[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, a horn ...

The system connects a bolt-clamped transducer with the brewing basket via a metallic horn—transforming the coffee basket into a powerful ultrasonic reactor. Dr. Trujillo said the ultrasound ...