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What are the white & gold super thin speaker things found in some toys called? Answered

They are gold and have something that looks like a white sticker on the other side. They have two wires coming out from under the white sticker. I have found these in several toys and smoke detectors I have disassembled and need to know their name.

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Jack A Lopez (author)kelseymh2010-03-19

I'd call it a piezoelectric speaker,  to sort of differentiate it from everything else out there that involving the piezoelectric effect, eg spark producing barbecue lighters, radio frequency crystals, etc.
http://en.wikipedia.org/wiki/Loudspeaker#Piezoelectric_speakers

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user

Thank you both! I have been wracking my brain for hours trying to figure out what it was called.

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rickharris (author)2010-03-20

More properly called a Piezoelectric sounder.

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