Advanced Practical Electronics - Circuits and Systems is meant to help the reader to put electronics into practice. It covers topics such as Introduction to Electronic Systems; Power Supplies (using either linear or switching regulators); Power Devices; Operational Amplifiers; Filtering and Filter Circuits; Transducers (sensors, detectors, and actuators); Signal Conditioning and Interfacing; Oscillators and Signal Generators; Embedded Systems; Power Amplifiers; Noise, Interference and Distortion; Internet of Things; Photocouplers (opto-couplers, opto-isolators, solid state relays). At the end of most of the chapters, there are some simulation for the circuits that are introduced in that particular chapter, where simulation is done using LTspice VIII, which is a freeware. LTspice is a SPICE-based analog electronic circuit simulator computer software, produced by semiconductor manufacturer Analog Devices. It is the most widely distributed and used SPICE software in the industry.