> -----Original Message-----
> From: Olin Lathrop [SMTP:olin_piclist@EMBEDINC.COM]
> Sent: Tuesday, April 08, 2003 1:20 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]: A metronome project
>
> > I've often wondered (ok, not THAT often) how to get a microcontoller to
> > generate a convincing "tick" or "tock" sound out of a speaker.  Little
> > beeps are just ... inelegant, and simply driving the cone with DC seems
> > like it would be too short...
>
> I did this once by running a 5V pulse into a speaker.  I sortof remember
> it was in the 1 to 10mS range, but this was a long time ago.  If the pulse
> is too long, you hear both edges.  If it's too short, the volume is
> reduced.  The pitch largely depends on the characteristics of the speaker.
>
>
A capacitvely coupled square wave works ok.  You get a loud tick on every
edge and don't keep DC current running through the speaker.  for the
ultimate you could sample the tick and tock from a classic metronome and pay
them back via a DAC or PWM.

Mike


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