Despite the predominance of digitalization, analog electronics continues to be an essential pillar in technological development and innovation. This book, "Analog Electronics: Exploring Signals and Circuits," is the second volume in a series dedicated to unraveling the mysteries and applications of electronics, with a special focus on its analog aspects. The importance of analog electronics lies in its omnipresence and versatility. From the capture of real-world signals to the final stage of actuation in digital systems, analog electronics form the indispensable interface that allows electronic devices to interact with their environment. This book is designed not only to teach the fundamental principles and theories of analog electronics, but also to show how these concepts are applied in practice, opening up a world of possibilities for engineering design and innovation. This volume is structured to guide the reader through an educational journey, starting with the fundamentals of analog electronics, exploring the basic components, and progressing to more complex concepts such as operational amplifiers, analog filters, oscillators, and power circuits. Each chapter is designed to build on previous knowledge, ensuring a solid understanding of each topic before proceeding to the next. Additionally, the practical application of theory is emphasized, with examples and exercises that allow the reader to directly experiment with the concepts discussed.