**5. Conclusions**

We modify a jerk circuit with Chua's diode, and investigate its chaotic properties. This system can be mathematically described by a system of ordinary differential equations with a piecewise linear function and exponential term. The analysis shows that this system has three collinear equilibrium points. The time waveform about each equilibrium point depends on its associated eigenvalues. Indeed, all three equilibrium points are of type saddle focus, meaning that the trajectories of *x*(*t*) and *y*(*t*) diverge in a spiral form but *z*(*t*) converges to the equilibrium point for any initial point (*x*(0), *y*(0), *z*(0)). Numerical simulation illustrates that the oscillations are dense, have no period, are highly sensitive to initial conditions, and has a chaotic hidden attractor. Table 1 shows the comparison between three chaotic systems: the proposed system in this paper and the two existing systems in [14,19]. One of the advantages of the proposed system is a higher sensitivity to initial conditions. Therefore, the proposed system enables an alternative model for chaotic theory.


**Table 1.** The comparisons of a modified chaotic jerk circuit and other related systems.

**Funding:** The author would like to thank King Mongkut's Institute of Technology Ladkrabang Research Fund, grant no. KREF046205 for financial supports.

**Acknowledgments:** This work was supported by King Mongkut's Institute of Technology Ladkrabang.

**Conflicts of Interest:** The author declares no conflict of interest.
