This book deals with modern devices for analog signal processing. It pays a particular attention to the main element of such devices: integral operational amplifiers (op-amps) and electronic devices based on them, including scaling, summing, integrating, and filtering linear devices. The principles of construction of nonlinear devices in op-amps are presented along with various circuit solutions for limiting, rectification, and piecewise linear conversion of input signals. The book also analyses sine wave and pulse and presents several examples of applying these devices to processing of signals from resistance, inductive, optical, and temperature sensors. This book is intended for students, learning the course “Instrument Making” and for advanced learning of the courses “Electronics” and “Electronics and Microprocessor Hardware,” but is can be also used by other students and engineers dealing with the design of electronic devices and systems.