Devices and main elements of electronics are described. Methods for calculating schematic components are outlined in a concise and accessible form. The main parameters of the described devices are given. The subject of electronic technology is the theory and practice of using electronic, ion and semiconductor devices in devices, systems and installations for various applications. Electronics represents a rapidly developing field of science and technology. She studies the principles of the design, operation and application of various electronic devices. For students of secondary vocational educational institutions. Can be useful to radio amateurs.