At 03:48 PM 2/27/97 -0600, Scott Horton wrote:
>David:
>
>Thanks for the suggestion.  Forgive my lack of understanding of speaker
>electronics but I don't understand a couple of things...maybe you can
>help.
>
>Your Suggested pseudo-code:
>>>Beep
>>>        Turn_On_Speaker_Bit
>>>         Delay
>>>         Turn_Off_Speaker_Bit
>>>         Delay
>>>         Goto Beep
  I actually
>NEED to use a small headphone.  The reason for this is that I need a user
>to audibly detect an discreet event being monitored by my PIC.
>Using you suggestion, how do I adjust volume, and tone on a set of
>headphone speaker(s)?

Change the loop to have on and off with two delays, ie delay1 and delay2.
Have power flow thru the headphones for a shorter time than the current is
off and the volume will go down. This is what PWM is all about.

Larry
Larry G. Nelson Sr.
L.Nelson@ieee.org
http://www.ultranet.com/~nr