Hi Koen,

Here's another option while you are working out the PIC details.

Use a program like Cool Edit and create a 440 Hz sine wave and other test
tones if you so desire.
Then burn a CD with the resultant WAV files.

Obviously this requires a CD player and is not as much fun as a PIC project,
but at least you have a quick solution in the interim period.

I seem to recall that using 50% duty cycle PWM on a PIC using a 19.6608 MHz
crystal, further divided externally with N number of flip-flops gave me
tones in the equal tempered musical scale including 440 Hz -- I'll see if I
can dig up the details.

You might also do a search on "top-octave generators".

Best regards,

Ken Pergola

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