@al
Yeah, I know. But ultrasonic emitters require more specialised parts than my famously lethal high voltage supply. I can't really do a Scrapheap Challenge version. I'd need to spend money and order in some parts.

*thinks*

Actually now, wait a minute...if I stole got an old tweeter from a decent loudspeaker, that may go high enough....and building an oscillator is pretty easy using bits I've got lying around the lab....

*dons labcoat*
( K2k6 has a proper job these days, Tue 29 Apr 2008, 15:41, Reply)