Circuits of Chaos - Page 1
Forum section: electronics / projects

author: Sariel
author_rank: Regular Contributor
timestamp: March 27, 2025, 02:13:17 pm
content: I would like to share some work and a circuit board I did about chaos circuits.There is a nice article that I published on ElctronicDesign about this work:https://www.electronicdesign.com/technologies/analog/article/55131908/circuits-of-chaos-building-lorenz-chua-and-rossler-strange-attractorsI have posted my design and Gerber files on my Github:https://github.com/Sariel-Hodisan/Chaotic-Circuits

author: jpanhalt
author_rank: Super Contributor
timestamp: March 27, 2025, 02:27:43 pm
content: Thank you for sharing, but why all the barriers to seeing the work? How about posting an image of the schematic and enough of the article for us to appreciate it on THIS site?

author: Picuino
author_rank: Super Contributor
timestamp: March 27, 2025, 02:30:46 pm
content: There is one circuit with chaotic behavior that I would have liked to study in more depth. It is simply a PWM controller in current mode running with duty cycles above 50%.In this application note they call it simply OPEN LOOP INSTABILITY, but it is a purely chaotic behavior that results in oscillations in the power supply that generates white noise that can be heard by the mechanical oscillation of the inductor.https://www.ti.com/lit/an/slua101/slua101.pdf

author: Sariel
author_rank: Regular Contributor
timestamp: March 27, 2025, 02:53:21 pm
content: I am also adding the PDF of the schematic and BOM.

author: mawyatt
author_rank: Super Contributor
timestamp: March 27, 2025, 06:49:28 pm
content: Might find this interesting.https://www.eevblog.com/forum/beginners/lorenz-attractor-(horowitz-design)-problems-on-pcb/msg3254644/#msg3254644Best

author: eugene
author_rank: Frequent Contributor
timestamp: March 28, 2025, 04:15:03 pm
content: Back in the 90's I built many hundreds of similar circuits on solderless breadboards. In fact, I built an array of 256 driven diode resonators that could be configured in any geometry, the most common being a 16x16 2D array or 256x1 1D array. The advantage of solderless breadboards is that you can modify the component values or even the entire circuit easily.I can see the PCB presented in the OP as being useful for classroom study by undergraduate students.Schematics of the individual circuits can easily be found online.

author: goodwillracer
author_rank: Newbie
timestamp: April 23, 2025, 02:47:25 am
content: Quote from: Sariel on March 27, 2025, 02:13:17 pmThis looks awesome—chaos circuits are such a fascinating area! Thanks for sharing the article and files. I’ll definitely check out the GitHub. Love seeing hands-on implementations of Lorenz and Chua attractors!

author: coppercone2
author_rank: Super Contributor
timestamp: April 23, 2025, 02:54:09 am
content: you can use inductors in these circuit too it looks like. Maybe a use for something like a shielded torrodial inductorThese circuits should be well shielded right? SO you don't have bias from interference

author: mawyatt
author_rank: Super Contributor
timestamp: April 23, 2025, 12:53:30 pm
content: Quote from: Sariel on March 27, 2025, 02:13:17 pmNice article!! You should give reference to Michael Kennedy's two IEEE papers from 1993, believe he is credited with the circuit concepts as we mentioned in post #3 link. This precipitated an investigation into "Analog Encryption" and also a 1993 internal company (Honeywell) newsletter article where the inductor was replaced with a "gyrator". Recall the beautiful analog Tek scope XY displays of the "Attractors" back then!!https://www.eevblog.com/forum/beginners/lorenz-attractor-(horowitz-design)-problems-on-pcb/msg3254644/#msg3254644It's nice to see that this interesting area is not totally forgottenGood luck on your Memristor research, what ever happed to all the hoopla HP created on such way back?Best

author: UnijunctionTransistor
author_rank: Frequent Contributor
timestamp: April 23, 2025, 01:13:02 pm
content: Thanks for sharing, I am subscribing to this thread to follow up on further discussion.