You are holding in your hands a book, which is a collection of practical recommendations and advice on the design, manufacture and adjustment of analog and digital electronic devices for various purposes. Each reader, in accordance with his or her level of training, will be able to find in this book recommendations on the selection and use of standard and specialized radio-electronic components, the development and use of electrical circuits, and tips on the manufacture and installation of printed circuit boards. The book describes the basic principles of design and assembly techniques for radio-electronic devices, the procedure for testing components, taking measurements in electrical circuits and repairing devices. The book is intended for a reader with a technical mindset who has already assembled electronic devices, and is addressed to a wide range of radio amateurs, both professionals, and for beginners.