The book is devoted to theoretical and practical aspects of the use of integrated operational amplifiers, which have now become the main elements of many automation devices, measuring equipment, telemetry and telemetry, computers and radio devices. The book details the methods of taking into account the influence of the parameters of operational amplifiers on the circuits of amplifying devices, nonlinear signal converters, generators, discrete devices. Reference materials on the most common amplifiers (709, 741, 777 and Norton amplifiers) are provided, as well as a large number of practical schemes for using operational amplifiers in various devices. The book is of interest as a reference and training manual for engineers, technicians and students of radio engineering specialties.