[sdiy] 5-scroll chaos circuit

[Ian Fritz]

At 06:17 PM 2/15/2008, Dave Manley wrote:
>Ian Fritz wrote:
>>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
>
>A while ago I looked at the various published wavefolders (JH, Ken Stone, 
>etc) and don't recall any of them using this structure.  Is this use of 
>OTA cells well known and used in other wavefolders.  You mention Serge, is 
>this essentially the Serge topology?

Dave --

I believe the scheme  is similar to the interpolating scanners of JH and 
Don Tillman, e.g.,
http://www.till.com/articles/scanner/index.html

If you set the alternate inputs high and low then you have a folder. (At 
least I think so.)

   Ian