The Chua circuit is an RLC circuit with four linear elements (two
capacitors, one resistor and one inductor) and a nonlinear diode, and
can be modeled by a system of three differential equations. The
equations for the Chua circuit are  :
With parameter values as G=0.7, C1=1/9, C2=1, m0=-0.5, m1=-0.8, Bp=1 and L=1/7, m1=-5/7 and , a chaotic attractor is obtained (Fig. 1).
In a beautiful paper , the topology of this attractor was described in terms of a branch manifold (template) as shown in Fig. 2. The first electronic circuit with a five-segment odd-symmetric v-i characteristic by Farhad Ayrom (Berkeley University) and Guo-Qun Zhong (Academia Sinica, Guangzhou, People’s Republic of China), designed an electronic circuit . A historical account on the discovery of this circuit is given in . According to Robert Ghrist and Philip Holmes, this attractor is characterized by a template which contains all possible knots .
 T. Matsumoto, A chaotic attractor from Chua’s circuit, IEEE Transactions on Circuits & Systems, 31 (12), 1055-1058, 1984.
 T. Matsumoto, L. O. Chua & M. Komuro, The double scroll, IEEE Transactions on Circuits & Systems, 32 (8), 798-818, 1985.
 G.-Q. Zhong & F. Ayrom, Experimental confirmation of chaos from Chua’s circuit, Circuit Theory and Applications, 13 (1), 93-98, 1985.
 C. Letellier & J.-M. Ginoux, Development of the nonlinear dynamical systems theory from radio-engineering to electronics, International Journal of Bifurcation & Chaos, 19 (7), 2131–2163, 2009.
 R. Ghrist & P. Holmes, An ODE whose solutions contain all knots and links, International Journal of Bifurcation & Chaos, 6 (5), 779-800, 1996.