The main objective of this book is to present the subject of Electronic devices and circuits, both analog and digital with sufficient depth.In this book we have included more examples, tutorial problems and objective test questions in almost all the chapters. The chapter on optoelectronic Devices has been expanded to include more application examples in the area of optical fibre networks. Table Of Contents: CONTENTS: l Semiconductor Physics l P.N. Junction Diode l Optoelectronic Devices l Special Diodes l D.C. Power Supplies l Regulated Power Supply l Biplar Junction Transistor l Load Lines and DC Biased Circuits l Transistor Equivalent Circuit and Models l Single-Stage Transistor Amplifiers l Multistage and Feedback Amplifiers l Feedback Amplifier l Field Effect Transistors l Breakdown Devices l Sinusoidal and Non-sinusoidal Oscillators l Modulation and Demodulation l Integrated Circuits l Op-Amp and its Applications l Number Systems and Codes l Logic Gates l Boolean Algebra & Logic Families l Electronic Instruments