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Analog Computation #01 - Chua's Circuit
Chua's Circuit is a circuit for an chaotic oscillation. It was invented 1983 by Leon O. Chua.
The circuit basicaly just needs 5 parts:
C1 = 10 nF
C2 = 100 nF
R = 5 kOhm potentimeter
L = 15 mH inductor or a gyrator
NR = Chua's Diode
If the potentiometer is adjusted on the right position the circuit will oscillate in an chaotic manner.
Build
One can build a Chua's Circuit with the analog computer Confetti. Two modules are needed: the Chua's Diode and a Gyrator. A Gyrator is more handy than an inductor so one can use one instead.
An alternative Chua's Diode one findes here:
Confetti 102 Chua's Diode (with real diodes)
To build a Chua's Circuit out of these board one needs additionally a breadboard, some jumper wire, two 9V batteries and these parts:
- Capacitors:
- 1x 100 nF
- 1x 10 nF
- Mechanical:
- 2x 9V battery clip
- 2x 3 pin strip (for the battery connector)
- Potentiometers:
- 1x 5 kOhm
Buy the Parts
All parts at mouser.de:
https://www.mouser.de/ProjectManager/ProjectDetail.aspx?AccessID=2db9b9b476
and as a PDF:
warenkorb_mouser.de_mai09_0601.pdf
See and Listen to it
One can connect an audio mixer (with a 500 kOhm resister) and oscilloscope probes to three different points. X and Y are at the connection of the capasitor and the poti. The third one (Z) is on the gyrator board.
An oscilloscope in X-Y mode should look like that:
