[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 ...

Ultrasonic Cutting Gouging machines or outfits providing ... Power Source / Station Power sources or power stations are power supplies used for soldering irons, tungsten inert gas (TIG) guns, metal ...