FW: Chaotic Oscillators (Lorenz)

[Toby Paddock]

>>They never showed the circuit, but did
>>show the analogue computer and the setup was not much
>>more than 4 or 5 opamps (maybe less, it's been years
>>and this is all from memory) and a handful of caps
>>and resistors.

KA4HJH[SMTP:terrymbowman at rica.net], July 10, 1998:
>I remember that one. They had a Lorenz attractor hooked to an X-Y scope.
>Looked idiotically simple.
>Terry Bowman, KA4HJH
>"The Mac Doctor"

That sounds like:

Strange New Science of Chaos (The)
NOVA explains "chaos," a new science that is making surprising sense out of chaotic phenomena in nature, from the weather to brain waves.
Original broadcast date: 01/31/89 

I loved that show, was it really that long ago?
I had a real urge to do the circuit.
Found the Lorenz equations and did a basic program (simple).
The question I had (still have) is:

The digital version is not continuous, you do the calculations, THEN feedback, and do it again.
Would you need to do the same in an analog ckt, like with some S/H?  I am guessing not.
But it seems like you would need something to limit the speed of the feedback loops.
Real slow and it might make a nice 3-phase LFO.
I would like to see a simple circuit.  

Hoping this finds you,
Toby Paddock
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