This is my first time being on this forum. I hope you guys can help me out with a little project I'm working on!
I wish to build a small plate-agitator about 12cm x 12cm. The agitator should be controlled by a dial and can alter frequencies between 80-200Hz and run on AA-batteries, or preferably, on those coin batteries.
That's just a PM speaker, you can buy them at almost any electronics supplier. Try Digikey, search for a flat one with a plastic cone. Do you have access to a frequency generator? If not, you can drive the speaker with a 555.