> When I did this (it was a Philips 80c552 chip, but same principles
> apply), I just used an RC filter and then AC coupled it into an audio
> amp. I ignored the header info at the start of the .wav file and
> played it like it was audio data, the result was just a slight click at
> the start of the sound. I set the PWM frequency as high as it would
> go. When not producing a sound set the PWM output to 50% (2.5V),
> as the data in the wave file is also biased at "half way".

Note that this WAV file hack only works if the WAV data is 8 bit monophonic.
In general this is a bad idea - don't try this at home.  Reading a WAV file
properly is really quite easy.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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