This volume, for engineers and students, presents the basic principles of transistor circuit analysis, basic per-stage building blocks, and feedback. The content is restricted to quasi-static (low-frequency) considerations, to emphasize basic topological principles. The reader will be able to analyze and design multi-stage amplifiers with feedback, including calculation and specification of gain, input and output resistances, including the effects of transistor output resistance. The presentation of feedback analysis includes important insights left out of other books. Multiple-path amplifiers is also a subject rarely found elsewhere, though common in practice. Both are covered with insights and from angles that will reduce analysis to inspection for readers. Some circuit transformations outlined within are especially helpful in reducing circuits to simpler forms for analysis. They are usefully applied in considering transistor circuits for which collector-emitter (or drain-source) resistance is not negligible, another often omitted topic which this book details. Examples are given throughout to illustrate application of principles.