The book is intended for the initial study of electronics by children and adolescents aged 8-12 years. The young reader will learn about capacitors and diodes, learn how to solder and make real layout and printed circuit boards, get acquainted with the oscilloscope and voltmeter. Much attention is paid to integrated circuits - both analog (operational amplifier) and digital (triggers and counters). At the end of the book is a list of tasks and questions for self-work. All components and materials for conducting experiments and research work with the book must be purchased separately, which additionally gives rise to imagination and ingenuity. The publication is recommended primarily for those children who would like not only to experience the feeling of delight from the work of an independently assembled electronic circuit, but also to learn how to invent these circuits!