saw to sine

[patchell]

WeAreAs1 at aol.com wrote:

> In a message dated 5/21/00 9:56:28 PM, you wrote:
>
> <<How do I convert a sawtooth to a sinewave?
> The saw looks like this / / / / and comes from a
> Fatman vco.>>
>
> The usual method is to first convert the saw to a triangle, using one of the
> several proven techniques, then convert the triangle to a sine with some
> nonlinear waveshaping, such as diode clipping or overdriving the input of a
> 3080 ota.  Unfortunately, the Fatman 555-based VCO's don't really provide a
> perfectly shaped sawtooth wave, so they don't lend themselves very well to
> the usual saw-to-triangle methods, most of which rely on a very uniform and
> linear ramp with a sharp fallback, in order to work correctly.  It's probably
> worth some experimenting, though.  There are several saw-to-triangle circuits
> out there among the various DIY websites.  Maybe  someone knows the URL's?
> (I don't..)
>
> Michael Bacich

    http://www.silcom.com/~patchell/tcvco/tcvco.pdf

    This has a somewhat reasonable saw->tri->sine converter in it.  Just ignore
the VCO part.

-Jim
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