[sdiy] 5-scroll chaos circuit

[Ian Fritz]

Hi all --

Here's an interesting chaos generator I recently came across.  These guys 
basically use a Serge-type wavefolder in the feedback path of a 3d-order LP 
filter.  They use OTA cells to make the folder.  One thing I noticed is 
that the transfer function starts out low and ends up high.  I tried using 
some waveshapers in a filter feedback loop once and never got any 
results.  This overall comparator-like function may be the key.

http://www.ecse.rpi.edu/%7Ekhaled/papers/El_2002.pdf

There are a number of other papers along this line which I'll be looking 
into later.

   Ian