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,
> 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?
Geren W Mortensen, Jr.
Keyboardist/Synthesist/Psuedo-guitarist - Ugota Wanit
Visit us on the web at http://www.gcmhobbies.com
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