Audio Systems: Is there such a thing as an SED?, light thanks, metal heat

Question
Hi:

Is there such a thing as a Sound-Emitting Diode [SED]? I googled "sound-emitting diode". Nothing factual came up. Just a bunch of jokes.

http://www.google.com/search?hl=en&lr=&safe=off&q=%22sound+emitting+diode%22&btn...

An SED is supposed to give out sound in a similar manner to which a LED gives out light.


Thanks,

Green

Answer
Not that I know of.  Doesn't mean that something is in the works.  Any thing that has magneto restrictive properties or electro-mechanical properties can become a transducer.

But, so far as a diode by itself that is intended to be a transducer, I am not aware of such.

HOWEVER: That being said, a diode mounted on a metal heat plate and conducting large amounts of current will cause the  heat plate to vibrate according to the current passing through the diode.  It makes a sound, but is not really a sound generator in the logical sense.

Hope this is not confusing.

C