... This book is, if possible, built in such a way that descriptions of specific electronic devices that can be built on their own are intertwined with the story of "architecture" and setting up circuits, about electrical circuits, their individual elements. However, everything that I wanted to tell about the basics of radio electronics could not be evenly "mixed" with the descriptions of homemade devices. Because you need to know about some things before you pick up a soldering iron. This is how large "blocks" of the basics of electrical engineering and radio electronics appeared in this book, including this first chapter. And if someone is especially impatient to "get behind the wheel," if anyone wants to immediately use a soldering iron, then let him, this impatient person, immediately take on descriptions of specific schemes - and there are a lot of them in the book - and skip those sections that seem too general. We only warn you in advance: you won't be able to win anything on this!