Piezoelectric speakers are found all around you, from musical greeting cards to the tweeters in your car stereo setup. Making your own piezo speakers is actually very easy, as [Steven] shows us after ...

Piezo conducers have been around for years. They tend to be the things that make the 'done' beep in a microwave or the buzz of an alarm clock. Piezos and contact mics have been used extensively by ...