An Introduction to Electronics covers the syllabus of B.Sc. Electronics, and is divided into twelve chapters viz. circuit analysis (network analysis and network theorems) semiconductors and semiconductor diodes, clippers and clampers, two terminal devices (rectifiers Zener, varactor and tunnel diodes, photodiode, LED and solar cell). Bipolar Junction Transistors (CE, CB, and CC configurations), Amplifiers two port networks, h-parameters and CE, CB, CC and RC coupled amplifiers, feedback in amplifiers, types of feedback sinusoidal oscillators (Colpitt, Hartley phase-shift and Wien bridge oscillators). Multivibrators three terminal devices (UJT, JFET, common source, common gate and common drain amplifiers, depletion and enhancement MOSFETs), Modulation and demodulation (AM, FM phase modulation, PAM, PWM, PPM and PCM) square law and linear diode detectors, Noise, shot noise, partition noise, flicker noise, transit time noise, thermal noise, white noise, excess resistor noise, noise in BJT and FET, and noise figure.