AVR-Chat

Hello Jim :)

You are probably thinking of a 'piezoelectric' speaker.  These often 
require higher voltages to drive them - here's a link for such a 
driver device:

   http://www.maxim-ic.com/appnotes.cfm/appnote_number/2914

Here's one link to a supplier of such speakers:

   http://www.murata.com/catalog/p15e6.pdf

I hope this helps.  Let me know if you need more info.

Frank
*******************
--- In AVR-Chat@yahoogroups.com, "Jim Wagner" <jim_d_wagner@...> 
wrote:
>
> I'm working on a big AVR project (a data radio) and need a
> small "loud speaker" for occasional use (error checking
> during setup, for example). 
> 
> So, does anyone know what the sound output transducers in
> cellphones are called? I've looked in catalogs and have
> found small tone makers, but no small voice-grade speakers.
> 
> 
> Suggestions of where to look would be appreciated!
> Jim, KA7EHK
> ---------------------------------------------------------------
> The Think Different Store
> http://www.thinkdifferentstore.com/
> For All Your Mac Gear
> ---------------------------------------------------------------
>