This book is for those who want to become an amateur radio designer and build wonderful electronic devices - receivers, amplifiers, radio stations, tape recorders. Starting with the simplest detector receiver, gradually, step by step, the reader will get acquainted with the principle of operation, circuits and structure of various homemade receivers, including multi-tube superheterodines. The book briefly outlines the elements of electrical engineering that a radio amateur needs to know, describes the operation of the main radio engineering parts - vacuum tubes, semiconductor devices, transformers, oscillating circuits, and also provides reference data necessary for a radio amateur to work independently.