This book introduces, in a popular science format, the design principles and techniques of chaotic circuits. Combining the lifelong dedication to teaching, researching, and popularizing electronic circuitry, it represents the research essence of the third-generation scholars in chaotic circuits from Lanzhou University, China for over twenty years. This book serves as an excellent introductory book and a reference tool for researchers in chaotic circuitry. High school-level education, along with a basic understanding of calculus and circuitry, suffices for comprehending the book's content.