Koen van Leeuwen wrote :

> The 'problem' is in the tuning fork feature, which I am
> making too hard perhaps. I don't like listening to square
> waves so I  thought of a 1 bit D/A converter using the USART
> and an audio power opamp integrator (hmm nice thing)...


Or, if *only* generating 440Hz, a passive
low-pass filter to "shape" the waveform.

B.t.w (and absolutly not as much fun :-) ), I bought
a guitarr tuning device for about $15. Generates
all 6 tones and has a builtin "analog" LCD meter
that shows how far out of tune you are. Everything
packed in something like a matchbox...

Jan-Erik.

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