Analog electronics circuits are electronic circuits that use continuous signals to represent information. These circuits are used to process and manipulate signals such as audio, video, and radio frequency signals. Analog circuits are designed to operate on a range of voltages and currents, and they use components such as resistors, capacitors, and inductors to create filters, amplifiers, and oscillators.

Analog circuits can be classified into two types: linear and nonlinear circuits. Linear circuits are those that produce an output that is proportional to the input, while nonlinear circuits produce an output that is not proportional to the input. Examples of linear circuits include amplifiers, filters, and voltage regulators, while examples of nonlinear circuits include oscillators and mixers.

Analog circuits are used in a wide range of applications, including audio and video processing, power supplies, and communication systems. They are also used in sensors and transducers, which convert physical quantities such as temperature, pressure, and light into electrical signals.

Analog circuits are often compared to digital circuits, which use discrete signals to represent information. While digital circuits are more precise and can store and process information more efficiently, analog circuits are better suited for processing continuous signals and are often used in applications where high fidelity and low noise are important.