[sdiy] Square to Sine

[Elain Klopke]

> The "sine wave" being generated by that 3RC circuit is not very good, with
> 4 or 5% THD at best.  A sine wave from a good sine VCO would be less than
> 1%, and a self-oscillating filter sine can be 0.1%.
>

is it "not very good" meaning "the output will be filled with static and
you can't hear the note" or "the waveform isn't a perfect sine wave and
will be fuzzy"? Because a little character I can deal with.

>
> Plus, this circuit only works at one frequency.  It would have to be
> redesigned for other frequencies.
>
>

In what I'm doing it only needs to work for one frequency and the other 90
can work on the rest of the notes. I'm not opposed to sitting with a
notebook and a calculator and crunching some numbers, it'll take me back to
high school math classes :)
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