[Lindsay] has a wonderful writeup about a new toy in the shop, an ultrasonic transducer ... high frequency AC power supply, and how to design a horn. Not missing the meaning of DIY [Lindsay ...

Ultrasonic horns and ultrasonic boosters are used with ultrasonic transducers and converters. Boosters or velocity transformers amplify ultrasonic vibrations. Ultrasonic horns, sontrodes, anvils, ...