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เนื้อหาย่อ : Preface: To the Student "Why Am I Learning This?" Have you ever found yourself asking this question? If you have, then take a moment to read on. Any subject is easier to learn if you understand why it is being taught and how it relates to your long-term goals. For this reason, we're going to take a moment to discuss a few things: How the material in this book relates to a career in electronics technology ㆍ How you can get the most out of this course Few developments have affected our lives during the past 30 years as profoundly as those in electronics technology. The electronic "gadgets" we take for granted, such as cellular phones, wireless LANs, hand-held computers, home theaters, global positioning systems, and personal audio systems, exist as a result of the advances in technology made during this time. As a result of improvements in production technology, many electronic systems that once filled entire rooms can now be held in the palm of your hand. Even so, these systems are extremely complex devices that contain a wide variety of components, and each of these components operates according to one or more fundamental principles. Learning how to work on various electronic systems begins with learning the components and principles that are common to all of them. These principles may not always have a direct bearing on how to repair a specific electronic system, but they must be learned if you are to understand why things work the way they do. Learning how and why things work as they do allows you to grow beyond the scope of any book (or course). Each electronics course serves, in part, as a foundation for the next. For example, you were taught about resistors, capacitors, and inductors in your fundamentals course. If you take a moment to flip through this book, you'll see that one or more of these components are used in nearly every circuit. Therefore, an understanding of fundamental components is vital to understanding the material presented in this text. Just as the knowledge of basic components and circuit principles is essential for understanding electronic devices and circuits, the material presented in this book forms a foundation for the courses that are to follow. This means that learning the material in this course is critical if your knowledge is to advance beyond the point where it is now. "How Can I Get the Most Out of This Course?" There are several steps you can take to ensure that you will successfully complete this course and advance to the next. The first is to accept the fact that learning electronics requires active participation on your part. If you are going to learn the material in this book, you must take an active role in your education. It's like learning to play a musical instrument. You need to practice on a regular basis. You can't learn how to play simply by "reading the book.' The same can be said about learning electronics. You must be actively involved in the learning process.