ELX120 Electronic Devices and Circuits
Electronic Devices and Circuits notes
10 chapter notes, in syllabus order. Each starts with the key points.
Unit 1
Semiconductor Physics: Atoms, Bonds, Doping, Charge CarriersUnit 1 of Electronic Devices and Circuits covers the atomic structure of semiconductors, covalent bonding, intrinsic/extrinsic semiconductors, doping, charge carriers (electrons/holes), and carrier concentration equations—foundational concepts for all diode and transistor behavior.10 min readUnit 2
PN Junction Diode: IV Curve, Biasing, Applications & ModelsUnit 2 of Electronic Devices and Circuits covers the PN junction diode’s construction, IV characteristics, biasing (forward/reverse), equivalent circuit models (ideal/real), and real-world applications in rectifiers, voltage regulation, and signal processing—with visuals of gate symbols, IV curves, and actual diode chi8 min readUnit 3
Diode Rectifiers & Clippers: Circuits, Analysis & ApplicationsUnit 3 of Electronic Devices and Circuits covers half-wave/full-wave rectifiers, clippers, and clampers, explaining their working principles, circuit configurations, performance metrics (efficiency, ripple factor), and real-world applications in power supplies and signal processing.11 min readUnit 4
Special Diodes: Zener, Varactor, LED, Photodiode, Schottky & TunnelUnit 4 of Electronic Devices and Circuits covers six specialized diodes—Zener, varactor, LED, photodiode, Schottky, and tunnel—explaining their construction, working principles, unique characteristics, and practical applications in voltage regulation, sensing, and optoelectronics, with real-world examples from Nepalese19 min readUnit 5
Bipolar Junction Transistor (BJT): Structure, Operation, Configurations & ApplicationsUnit 5 of Electronic Devices and Circuits explores the Bipolar Junction Transistor (BJT), covering its structure, working principles, biasing techniques, configurations (CE, CB, CC), and real-world applications in amplifiers, switches, and oscillators. This note includes visuals, comparisons, and exam-focused insights.10 min readUnit 6
Transistor Biasing: Methods, Stability & AnalysisUnit 6 of Electronic Devices and Circuits explains how to set a stable operating point (Q-point) for BJTs and FETs using fixed, voltage-divider, and feedback biasing. Covers DC analysis, stability factors, and real-world trade-offs in amplifier design.10 min readUnit 7
FETs: Types, Working, Biasing & ApplicationsUnit 7 of Electronic Devices and Circuits covers JFETs, MOSFETs, and their biasing techniques, including transfer characteristics, small-signal models, and real-world applications in amplifiers, switches, and digital circuits. Learn how FETs differ from BJTs, their pinch-off, threshold voltage, and amplification roles,11 min readUnit 8
Small-Signal Amplifiers: Configurations, Analysis & DesignUnit 8 of Electronic Devices and Circuits explores small-signal amplifiers, covering their configurations (CE, CB, CC), frequency response, hybrid-π model, and design considerations for voltage/current gain, bandwidth, and stability. Includes real-world applications, worked examples, and exam-focused tips.6 min readUnit 9
Op-Amp Basics, Configurations & ApplicationsUnit 9 of Electronic Devices and Circuits covers the ideal operational amplifier (op-amp), its configurations (inverting, non-inverting, differential, integrator, differentiator), frequency response, feedback analysis, and real-world applications in signal processing, measurement, and control systems. Learn how op-amps13 min readUnit 10
Oscillators & Power Supplies: Design, Analysis & ApplicationsUnit 10 of Electronic Devices and Circuits covers oscillator circuits (LC, RC, crystal) and power supplies (transformers, rectifiers, filters, regulators), explaining their working principles, design equations, and real-world applications in computing, telecom, and embedded systems.11 min read