Waveshaper

Geren W. Mortensen, Jr. gcmhobbies at earthlink.net
Tue Apr 20 16:36:30 CEST 1999


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> Here is my favourite waveshaper. This circuit idea was published in
> Wireless World, several years ago. As you move the pot slider the
> circuit slowly morphs from "aka-log" through almost linear to
> "aka-exp". I love this extremely simple idea and have used it in my VCO.
>
> Note, that feeding it with a triangle wave (e.g. from my favourite VCO
> based on symmetric charge-discharge scheme) you get all the basic
> waveforms without the need of separate nonlinear shaping and further
> complicated crossfade. It is an ideal solution for a micro synth design.
>
> The value of the pot heavily depends on the diodes used as well as
> on the input signal amplitude. Typically I use 22k or 47k. OA is TL071.
>
> have fun,
>
> m.b.
>
> --
>
> Maciej Bartkowiak
> ========================================================================
> Institute of Electronics and Telecommunication     fax: (+48 61) 8782572
> Poznan University of Technology          phone: (+48 61) 8791016 int.171
> Piotrowo 3A                             email: mbartkow at et.put.poznan.pl
> 60-965 Poznan POLAND               http://www.et.put.poznan.pl/~mbartkow
> ========================================================================
>
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Hi!  On my system, the very bottom of the schemo is cut off.  Should I
presume you're connecting the + input of the OA to ground?

Thanks

Geren W Mortensen, Jr.

--
Keyboardist/Synthesist/Psuedo-guitarist - Ugota Wanit

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