--- Stephen R Phillips <cyberman_phillips@yahoo.com>
wrote:

> 
> 
> --- kravnus wolf <kravnus@yahoo.com> wrote:
> 
> > hi there,
> > 
> >     I am currently using a PIC to generate tones
> on
> > the speaker. It runs on 5Volts. The speaker
> produce a
> > tone which is too soft to hear after 5 meters
> away. Is
> > it possible to increase the volume of the speaker
> > using a 5Volts setup?
> > 
> > Thanks,
> > John Chung
> 
> Yes you would want to use a bridge setup to drive
> the speaker. Driving
> it with 5V gives you a 5Vpp signal or a 2.5V and a
> bit smaller RMS wise
> in a bridge configuration you have 10Vpp which is a
> much larger signal
> (and thus louder).   To do this however you need 2
> PIC pins and 4
> transistors in a full bridge setup. A less
> complicated variant is to
> use a dual channel audio amp that can run off 5V and
> bridge the output.
>  

  Interesting idea with the bridge. Any sites with the
schematics to ease my search ;)

John
> 
> Another way to increase volume is to use a lower
> impedance speaker. All
> of these suggestions use more power so I recomend
> some careful
> decoupling to prevent the noise being injected into
> the power supply.
> 
> Stephen R. Phillips was here
> Please be advised what was said may be absolutely
> wrong, and hereby this disclaimer follows.  I
> reserve the right to be wrong and admit it in front
> of the entire world.
> 
> 
> 		
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