Right now at Harbor Freight Tools they're selling a handheld "ultrasonic stain cleaner" the size of a dremel tool.
These contain a big paired piezo transducer running at 55KHz bolted to a steel "horn." All for ten dollars clearance sale! (down from $25) This price was at their retail store, not online. http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=96474 The transducer in the above device is a fairly huge thing, like a tiny version of an ultrasonic welder. Not for kids, it probably delivers internal burns. I've seen similar transducers sold on eBay for $50. The driver board has 3.3V logic and 6V mosfets, probably easy to pulse it and crank it up to much higher power. I'm currently drawing up a schematic. Drops of water placed on the steel tip will spray out as mist. If swept slowly over a polyethelene bag, it welds the sheets together (but a crappy weld, pops apart again if tugged.) If the tip is submerged in water about 5mm away from a surface, loud random screech of cavitation is heard. Also... For nebulizing water, those "mist fountain" or "ultrasonic humidifier" devices can be found online for under $30. They run at much higher power than the above device, but run at 1MHz or so. (((((((((((((((((( ( ( ( ( (O) ) ) ) ) ))))))))))))))))))) William J. Beaty SCIENCE HOBBYIST website billb at amasci com http://amasci.com EE/programmer/sci-exhibits amateur science, hobby projects, sci fair Seattle, WA 206-762-3818 unusual phenomena, tesla coils, weird sci
