>Isn't it fun contorting square waves!

        It's funnier to square sinusoidal waves :oD

>Mike Keitz made one. Where's Mike?

        Tell me too :o)

>There are some practical problems with Magic Sinewaves. On a pic at least,=
 they
>can only be implemented in software. This requires isochronous code.

        And?

>(BTW, a better way to control the frequency is to PLL the RC oscillator on=
 a PIC
>- something else Mike has done).

        Nice idea...I'm working on it :oD

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