I am designing a fairly small (25 x 25 x 25 mm) robot, and I want to have some sound output. A simple click or buzz or beep will do quite nicely. The smallest device I've been able to find is a cell phone speaker that's
Mark
to
ly.
I think cellphone speaker can fit very well in you robot. You can make small power amplifier and place 4-5 pieces speakers surrounding your robot. The simplest is just put a loud beeper, very loud indeed.
You can take a piece of bimorph piezo material and make it 1 X 1x .001 mm if you want. It would need driven by a signal, and the smaller it is the less LF energy its going to have.
greg
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