Chaos for the Home Electronics Lab Wesley Thio. Linear Circuits.

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Presentation transcript:

Chaos for the Home Electronics Lab Wesley Thio

Linear Circuits

In linear circuits, voltage is proportional to the current

Linear circuit examples

Tesla Coil

RLC circuit

Equipment Function Generator Oscilloscope Power supply

In nonlinear circuits, voltage is not proportional to current In nonlinear circuits, voltage is not proportional to current

Van Der Pol Oscillator Neon Bulb

Neon Bulb nonlinearity

LorenzVan Der Pol Chua

Step 1: RLC circuit (parallel)

In a RLC circuit, there is one stable equilibrium point at the origin In a RLC circuit, there is one stable equilibrium point at the origin

Chua’s Nonlinear resistor 3 Equilibrium points (marked red)

Step 2: Nonlinear Resistor Lorenz System Rossler System

Step 3: Add a third capacitor or inductor

Chua’s Circuit

Phase Space: Take the voltage across the capacitors… Voltage across capacitor 1 Voltage across capacitor 2 time time

And plot them together! Voltage across capacitor 1 Voltage across capacitor 2

3-D phase space

Period doubling bifurcation Period-4 Period-1Period-2 Chaos

Synchronization of Chua’s Circuit MasterSlave

Analog computation Waterwheel behaving according to Lorenz equations

Integrator Adder Op amp configurations Inverter

Analog computing example

Lorenz circuit

Bistability in a Hyperchaotic System with a Line Equilibrium (2014) Coauthors: (C. Li, J.C Sprott, W. Thio, )

A New Piecewise Linear Hyperchaotic Circuit (2014) Coauthors: (C. Li, J.C Sprott, W. Thio, H. Zhu)

What are the applications?

Secure communications Master Slave

AMOS-WD06: Cockroach robot using chaos control

Memristors

References A Concise Guide to Chaotic Electronic Circuits (Buscarino, Fortuna, Frasca, Sciuto 2014) A New Chaotic Jerk Circuit (Sprott 2011) A Practical Guide for Studying Chua’s Circuits (Kilic 2010) A simple circuit implementation of a Chaotic Lorenz System (Corron 2010) Chaos and Time Series Analysis (Sprott 2003) Chua’s Circuit Implementations: Yesterday, Today and tomorrow (Fortuna, Frasca, Xibilia 2009) Development of Memristor Based Circuits (Lu, Fitch 2013) Elegant Chaos (Sprott 2010) Three Steps to Chaos - Part I: Evolution (Kennedy 1993) Three Steps to Chaos - Part II: A Chua’s Circuit Primer (Kennedy 1993)