Electrical based ebooks are in great demand these days. However if you search hard enough, there’s a lot of freely available online resources out there which you can take advantage of. Here are a few (do leave your comments if you know of others):-
* Note: Some of the PDF’s listed down here might be too big in size to be viewed directly from your browser. Unless you have a very fast connection or just want to take a peek or view it briefly, I’d suggest right clicking and saving it straight to your computer for each of the ebooks under the PDF category.

1. Electrical Facilities Safety (PDF)
2. Electronics Tutorials (HTML)
3. Op Amp Circuit Collection (PDF)
4. Digital Logic basics (HTML)
5. 555 timer circuits (HTML)
6. Handbook of operational amplifier applications (PDF)
7. Electromagnetic Fields and Energy (free college textbook online) (HTML)
8. Classical Electromagnetism by Richard Fitzpatrick (HTML)
9. Directory of Ebooks by Pacontrol.com – 54 ebooks (PDF)
10. Electrical Science (PDF)
    • Electrical Science Volume 1
    • Electrical Science Volume 2
    • Electrical Science Volume 3
    • Electrical Science Volume 4
11. Lazar’s power electronics guide (HTML & PDF)
12. Electric Motor Controls  Tutorials (PDF)
13. gerbv – A Free/Open Source Gerber Viewer (Software)
14. PCB – interactive printed circuit board editor for the X11 window system (Software)
15. Programmable Controllers Theory and Implementation (PDF)
16. Automating Manufacturing Systems with PLCs (PDF) – 11MB
17. More PLC stuffs – Basics, Glossary, Laws (PDF)
18. Process Control Fundamentals (PDF)
19. Ebooks from Texas Instruments (Source: SMPS.US)
    • Introduction and Basic Magnetics (PDF)
    • Magnetic Core Characteristics (PDF)
    • Windings data (PDF)
    • Power supply transformer design (PDF)
    • Inductor and Flyback Transformer Design (PDF)
    • For the remaining 7 ebooks (click here and scroll down under “Unitrode seminar magnetics handbook”
20. Lessons In Electric Circuits (Posted before, but worth re-mentioning) – HTML & PDF
    • Volume I – DC
    • Volume II – AC
    • Volume III – Semiconductors
    • Volume IV – Digital
    • Volume V – Reference
    • Volume VI – Experiments

Topical worksheets

Together, these worksheets constitute a body of questions far too large to be comprehensively covered in any single electronics course. That is not the point, though. This collection is purposely oversized so you may pick and choose enough questions to meet your specific teaching needs. Download those worksheets containing questions you wish to use, and then only assign those questions to your students for research and discussion. The rest may be ignored, or your students may find them useful as study aids outside of class.

Although I strive to make each of these worksheets self-contained, some topics will (necessarily) assume coverage of prior topics. For instance, it would be impossible for a beginning student to understand a worksheet on series-parallel resistor circuits without first having understood Ohm's Law.

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General:

• Index of question files: [Plain-text]
• How to turn any breadboarded circuit into a valid troubleshooting assessment: [PDF]
• Student surveys (for regular inclusion in worksheets/exams): [PDF]
• Questions relating to project management: [PDF]
• Test page for adjustment of copy machine: [Encapsulated PostScript] [PDF]

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Printed Circuit Boards:

• Gerber files for 2x3 inch breadboard PCB (.zip archive): [ZIP]

• General explanation for troubleshooting PCBs

• Schematic diagram for simple 10-resistor series troubleshooting circuit: [PDF]
• Gerber files for 4x4 inch troubleshooting PCB of a simple 10-resistor series circuit (.zip archive): [ZIP]

• Schematic diagram for loaded voltage divider troubleshooting circuit: [PDF]
• Gerber files for 4x4 inch troubleshooting PCB of a loaded voltage divider circuit (.zip archive): [ZIP]

• Schematic diagram for quarter-active Wheatstone bridge troubleshooting circuit: [PDF]
• Gerber files for 4x4 inch troubleshooting PCB of a Wheatstone bridge circuit (.zip archive): [ZIP]

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Basic electricity:

• Atomic structure: [PDF]
• Static electricity: [PDF]
• Voltage, Current, and Resistance: [PDF]
• Conductors and insulators: [PDF]
• Elementary circuits: [PDF]
• Electrical connections: [PDF]
• Soldering: [PDF]
• Sources of electricity: [PDF]
• Physical effects of electricity: [PDF]
• Resistors: [PDF]
• Switches: [PDF]
• Basic voltmeter use: [PDF]
• Basic ammeter use: [PDF]
• Basic circuit troubleshooting: [PDF]
• Ohm's Law: [PDF]
• Energy, work, and power: [PDF]
• Electric shock: [PDF]
• Arc flash and arc blast: [PDF]
• Safety grounding: [PDF]
• Lock-out / Tag-out: [PDF]
• Wire types and sizes: [PDF]
• Design Project: Telegraph system [PDF]
• Magnetism: [PDF]
• Basic electromagnetism and electromagnetic induction: [PDF]
• Basic relays: [PDF]
• Series DC circuits: [PDF]
• Parallel DC circuits: [PDF]
• Basic ohmmeter use: [PDF]
• Specific resistance: [PDF]
• Temperature coefficient of resistance: [PDF]
• Batteries: [PDF]
• Overcurrent protection: [PDF]
• Basic troubleshooting strategies: [PDF]
• Performance assessments for basic electricity: [PDF]

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DC electric circuits:

• Voltage divider circuits: [PDF]
• Current divider circuits: [PDF]
• Kirchhoff's Laws: [PDF]
• Potentiometers: [PDF]
• Series-parallel DC circuits: [PDF]
• Voltmeter design: [PDF]
• Ammeter design: [PDF]
• Design Project: Voltmeter [PDF]
• DC bridge circuits: [PDF]
• DC metrology: [PDF]
• Magnetic units of measurement: [PDF]
• Intermediate electromagnetism and electromagnetic induction: [PDF]
• Capacitance: [PDF]
• Capacitors: [PDF]
• Inductance: [PDF]
• Inductors: [PDF]
• Time constant circuits: [PDF]
• Time constant calculations: [PDF]
• DC transducers (INCOMPLETE): [PDF]
• DC generator theory: [PDF]
• DC motor theory: [PDF]
• Design Project: DC motor [PDF]
• DC motor control circuits: [PDF]
• Performance assessments for DC: [PDF]

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AC electric circuits:

• AC waveforms: [PDF]
• Basic oscilloscope operation: [PDF]
• Peak, average, and RMS measurements: [PDF]
• Design Project: Four-channel audio mixer [PDF]
• AC phase: [PDF]
• Inductive reactance: [PDF]
• Capacitive reactance: [PDF]
• Impedance: [PDF]
• Trigonometry for AC circuits: [PDF]
• Phasor mathematics (INCOMPLETE): [PDF]
• Series and parallel AC circuits: [PDF]
• Resonance: [PDF]
• Series-parallel combination AC circuits: [PDF]
• Mixed-frequency signals: [PDF]
• Decibel measurements: [PDF]
• Passive filter circuits: [PDF]
• Design Project: Audio tone control [PDF]
• Passive integrator and differentiator circuits: [PDF]
• Oscilloscope trigger controls: [PDF]
• Mutual inductance: [PDF]
• Step-up, step-down, and isolation transformers: [PDF]
• Autotransformers: [PDF]
• Impedance matching with transformers: [PDF]
• Advanced electromagnetism and electromagnetic induction: [PDF]
• Electrical noise and interference (INCOMPLETE): [PDF]
• Design Project: Sensitive audio detector [PDF]
• AC power: [PDF]
• Characteristic impedance: [PDF]
• AC transducers (PENDING): [PDF]
• AC metrology: [PDF]
• Polyphase power systems: [PDF]
• Delta and Wye 3-phase circuits: [PDF]
• AC generator theory: [PDF]
• AC motor theory: [PDF]
• AC motor control circuits: [PDF]
• Microphones (INCOMPLETE): [PDF]
• Fundamentals of radio communication (INCOMPLETE): [PDF]
• Performance assessments for AC: [PDF]

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Network analysis techniques:

• Component modeling: [PDF]
• Superposition theorem: [PDF]
• Thevenin's, Norton's, and Maximum Power Transfer theorems: [PDF]
• Millman's theorem: [PDF]
• Simultaneous equations for circuit analysis: [PDF]
• DC branch current analysis (INCOMPLETE): [PDF]
• DC mesh current analysis (INCOMPLETE): [PDF]
• AC network analysis: [PDF]
• Performance assessments for network analysis (INCOMPLETE): [PDF]

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Discrete semiconductor devices and circuits:

• Electrical conduction in semiconductors: [PDF]
• PN junctions: [PDF]
• Electron versus Conventional flow: [PDF]
• Rectifying diodes: [PDF]
• Rectifier circuits: [PDF]
• Basic AC-DC power supplies: [PDF]
• Design Project: AC-DC power supply [PDF]
• Design Project: Dual-output AC-DC power supply [PDF]
• Design Project: Simple component curve-tracer circuit [PDF]
• Clipper and clamper circuits: [PDF]
• Miscellaneous diode applications: [PDF]
• Zener diodes: [PDF]
• Special diodes (INCOMPLETE): [PDF]
• Elementary amplifier theory: [PDF]
• Bipolar junction transistor theory: [PDF]
• Bipolar junction transistors as switches: [PDF]
• Bipolar junction transistors in active mode: [PDF]
• Bipolar transistor biasing circuits: [PDF]
• Regulated power sources: [PDF]
• Design Project: DC voltage regulator [PDF]
• Class A BJT amplifiers: [PDF]
• Class B BJT amplifiers: [PDF]
• Class C BJT amplifiers (INCOMPLETE): [PDF]
• Design Project: Audio power amplifier [PDF]
• BJT amplifier troubleshooting: [PDF]
• Junction field effect transistors: [PDF]
• JFET amplifiers: [PDF]
• Insulated gate field effect transistors: [PDF]
• Insulated gate bipolar transistors (INCOMPLETE): [PDF]
• IGFET amplifiers (INCOMPLETE): [PDF]
• Conventional transistor overview and special transistors (INCOMPLETE): [PDF]
• Active loads in amplifier circuits (INCOMPLETE): [PDF]
• Optoelectronic devices: [PDF]
• Differential transistor amplifiers: [PDF]
• Multi-stage transistor amplifiers: [PDF]
• Oscillator circuits: [PDF]
• Design Project: Radio transmitter [PDF]
• Thyristors: [PDF]
• Thyristor application circuits: [PDF]
• Signal modulation (INCOMPLETE): [PDF]
• Power conversion circuits: [PDF]
• Fiber optics (PENDING): [PDF]
• Performance assessments for semiconductors: [PDF]

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Analog integrated circuits:

• IC fabrication and packaging (INCOMPLETE): [PDF]
• Printed circuit board layout and manufacture (INCOMPLETE): [PDF]
• Design Project: LED stroboscope [PDF]
• Design Project: Signal generator [PDF]
• Basic operational amplifiers: [PDF]
• Open-loop opamp circuits: [PDF]
• Design Project: Pulse-width modulation (PWM) signal generator [PDF]
• Negative feedback opamp circuits: [PDF]
• Positive feedback opamp circuits: [PDF]
• Inverting and noninverting opamp voltage amplifier circuits: [PDF]
• Design Project: Intercom system [PDF]
• Design Project: Audio media-based signal generator [PDF]
• Design Project: Sensitive microphone amplifier [PDF]
• Summer and subtractor opamp circuits: [PDF]
• Voltage/current converter opamp circuits (INCOMPLETE): [PDF]
• Linear computational circuitry: [PDF]
• Servo motor systems (PENDING): [PDF]
• Precise diode circuits: [PDF]
• AC negative feedback opamp circuits: [PDF]
• Opamp oscillator circuits: [PDF]
• Active filters: [PDF]
• Logarithms for analog circuits: [PDF]
• Nonlinear opamp circuits: [PDF]
• Phase-locked loops (INCOMPLETE): [PDF]
• Performance assessments for analog integrated circuits: [PDF]

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Digital circuits:

• Design Project: Logic probe [PDF]
• Digital logic signals: [PDF]
• Basic logic gates: [PDF]
• Numeration systems: [PDF]
• Binary arithmetic: [PDF]
• Digital codes: [PDF]
• TTL logic gates: [PDF]
• CMOS logic gates: [PDF]
• Basic logic gate troubleshooting: [PDF]
• Electromechanical relay logic: [PDF]
• Time-delay electromechanical relays: [PDF]
• Protective relay circuits (INCOMPLETE): [PDF]
• Boolean algebra: [PDF]
• Sum-of-Products and Product-of-sums expressions: [PDF]
• Karnaugh mapping: [PDF]
• Binary math circuits: [PDF]
• Encoders and decoders: [PDF]
• Multiplexers and demultiplexers: [PDF]
• Digital display circuits: [PDF]
• Programmable logic technology: [PDF]
• Latch circuits: [PDF]
• Timer circuits: [PDF]
• Flip-flop circuits: [PDF]
• Design Project: Light-pulse switch [PDF]
• Design Project: Power inverter [PDF]
• Counters: [PDF]
• Design Project: Event counter [PDF]
• Shift registers: [PDF]
• Design Project: Arbitrary waveform generator [PDF]
• Digital-to-Analog conversion: [PDF]
• Analog-to-Digital conversion: [PDF]
• Switched capacitor circuitry: [PDF]
• Digital communication (INCOMPLETE): [PDF]
• Memory devices: [PDF]
• Finite state machines (PENDING): [PDF]
• Microprocessor function (PENDING): [PDF]
• Microprocessor programming (INCOMPLETE): [PDF]
• Microcontroller principles (INCOMPLETE): [PDF]
• Programmable logic controllers (INCOMPLETE): [PDF]
• High-reliability circuits (INCOMPLETE): [PDF]
• Stepper motors (INCOMPLETE): [PDF]
• Design Project: Stepper motor driver [PDF]
• Performance assessments for digital: [PDF]

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Mathematics for electronics:

• Scientific notation and metric prefixes: [PDF]
• Basic algebra and graphing for electric circuits: [PDF]
• Algebraic equation manipulation for electric circuits: [PDF]
• Algebraic substitution for electric circuits: [PDF]
• Logarithms for analog circuits: [PDF]
• Simultaneous equations for circuit analysis: [PDF]
• Trigonometry for AC circuits: [PDF]
• Phasor mathematics (INCOMPLETE): [PDF]
• Calculus for electric circuits: [PDF]

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Circuit animations:

• Simple switch circuit animation: [fast GIF] [slow GIF] [PDF]
• Soldering a wire to a lug: [fast GIF] [slow GIF] [PDF]
• Electromagnetic induction: [fast GIF] [slow GIF] [PDF]
• Thevenin's theorem demonstrated: [fast GIF] [slow GIF] [PDF]
• Lissajous figures on an oscilloscope (0 degrees phase shift): [fast GIF] [slow GIF] [PDF]
• Lissajous figures on an oscilloscope (90 degrees phase shift): [fast GIF] [slow GIF] [PDF]
• Lissajous figures on an oscilloscope (180 degrees phase shift): [fast GIF] [slow GIF] [PDF]
• Lissajous figures on an oscilloscope (2:1 frequency ratio): [fast GIF] [slow GIF] [PDF]
• Three-phase motor, rotating magnetic field: [fast GIF] [slow GIF] [PDF]
• Transmission line with open end: [fast GIF] [slow GIF] [PDF]
• Transmission line with shorted end: [fast GIF] [slow GIF] [PDF]
• Transmission line with terminated end: [fast GIF] [slow GIF] [PDF]
• Semiconductor diode junction (forward biased): [fast GIF] [slow GIF] [PDF]
• Bridge rectifier circuit with ideal diodes: [fast GIF] [slow GIF] [PDF]
• Bridge rectifier circuit with real diodes: [fast GIF] [slow GIF] [PDF]
• BJT characteristic curve sketching: [fast GIF] [slow GIF] [PDF]
• Push-pull transistor amplifier with crossover distortion: [fast GIF] [slow GIF] [PDF]
• Pulse-width modulation comparator circuit: [fast GIF] [slow GIF] [PDF]
• Telephony multiplexer system: [fast GIF] [slow GIF] [PDF]
• Johnson ring counter circuit (with timing diagram): [fast GIF] [slow GIF] [PDF]
• ROM memory addressing: [fast GIF] [slow GIF] [PDF]

Math animations:

• Differentiation and integration: [fast GIF] [slow GIF] [PDF]

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Bellingham Technical College students ("Core" Electronics course worksheets):

DC Electric Circuits

ELTR100 (DC 1), Section 1: [PDF]	ELTR100 (DC 1), Section 2: [PDF]	ELTR100 (DC 1), Section 3: [PDF]

ELTR105 (DC 2), Section 1: [PDF]	ELTR105 (DC 2), Section 2: [PDF]	ELTR105 (DC 2), Section 3: [PDF]

AC Electric Circuits

ELTR110 (AC 1), Section 1: [PDF]	ELTR110 (AC 1), Section 2: [PDF]	ELTR110 (AC 1), Section 3: [PDF]

ELTR115 (AC 2), Section 1: [PDF]	ELTR115 (AC 2), Section 2: [PDF]	ELTR115 (AC 2), Section 3: [PDF]

Discrete Semiconductor Circuits

ELTR120 (Semi 1), Section 1: [PDF]	ELTR120 (Semi 1), Section 2: [PDF]	ELTR120 (Semi 1), Section 3: [PDF]

ELTR125 (Semi 2), Section 1: [PDF]	ELTR125 (Semi 2), Section 2: [PDF]	ELTR125 (Semi 2), Section 3: [PDF]

Operational Amplifier Circuits

ELTR130 (Opamps 1), Section 1: [PDF]	ELTR130 (Opamps 1), Section 2: [PDF]

ELTR135 (Opamps 2), Section 1: [PDF]	ELTR135 (Opamps 2), Section 2: [PDF]

Digital Circuits

ELTR140 (Digital 1), Section 1: [PDF]	ELTR140 (Digital 1), Section 2: [PDF]	ELTR140 (Digital 1), Section 3: [PDF]

ELTR145 (Digital 2), Section 1: [PDF]	ELTR145 (Digital 2), Section 2: [PDF]	ELTR145 (Digital 2), Section 3: [PDF]

A book used for teaching upper level and graduate courses in engineering analysis. It is currently being used to teach EGR 600 - Analysis. This book emphasizes programming - this is not found in any other autoamtion books available. At present, half of the book is written chapters, while the other half is in note form.

Chapters

• The complete book in PDF

Chapters

• Numbers and units [PDF]
• Algebra [PDF]
• Trigonometry [PDF]
• Vectors [PDF]
• Matrices [PDF]
• Graphing [PDF]
• Programming [PDF]
• Permutations [PDF]
• Statistics [PDF]
• Reliability [PDF]
• Calculus [PDF]
• Differential Equations [PDF]
• ECE Review [PDF]
• ME Review [PDF]
• PDM Review [PDF]
• MO Review [PDF]
• Boolean [PDF]
• Number Systems [PDF]
• Transforms [PDF]
• Geometry [PDF]
• Financial [PDF]
• Optimization [PDF]
• Projects [PDF]
• Graphs [PDF]
• Trees [PDF]

Downloads

• Source code directories

Links

• Numerical Recipes in C

This book introduces the basic concepts of system modeling with differential equations.

Status

The draft version includes updates made during the fall of 2004, including many corrections and clarifications.

Chapters (FROM THE DRAFT VERSION 2.6)

• Introduction (PDF)
• Translation (PDF) (PPT)
• Solving Differential Equations (PDF) (PPT)
• Numerical Methods (PDF) (PPT)
• Rotation (PDF) (PPT)
• Transfer Functions (PDF) (PPT)
• Circuits (PDF) (PPT)
• Feedback Control Systems and Block Diagram (PDF)s (PPT)
• Phasor Analysis (PDF) (PPT)
• Bode Plots (PDF) (PPT)
• Root Locus Plots (PDF) (PPT)
• Non-linear systems (PDF) (PPT)
• Analog IO (PDF) (PPT)
• Sensors (PDF) (PPT)
• Actuators (PDF) (PPT)
• Motion Control Systems (PDF) (PPT)
• Laplace Techniques (PDF) (PPT)
• Linear Systems (PDF) (PPT)
• Convolution (PDF)
• State Analysis (PDF)
• State Based Controls (PDF)
• System Identification(PDF)
• Magnetic Systems (PDF) (PPT)
• Fluids (PDF) (PPT)
• Thermal (PDF) (PPT)
• Optimization(PDF)
• Finite Element Analysis(PDF)
• Fuzzy Logic(PDF)
• Neural Networks(PDF)
• Embedded Systems(PDF)
• Lab Guide (PDF)
• Writing (PDF)
• Math Review Guide (PDF)
• C Programming Review (PDF)
• Units (PDF)
• Materials (PDF)

Downloads

• Version 2.6 (CURRENT DRAFT VERSION) PDF (5.5MB) January 5, 2005
• Version 2.4 PDF (5.2MB) January 26, 2004
• Version 2.3 PDF (4.4MB) August 25, 2003
• Version 2.2 PDF (4.4MB) July 22, 2002
• Version 2.1 PDF (4.3MB) March 31, 2002 (HTML)
• Version 2.0 PDF (4.3MB) January 10, 2002
• Version 1.0 PDF (3.5MB) August 10, 2001

(C) 1996-2005 Hugh Jack, ABSOLUTELY NO WARRANTY

Tommy W. S. Chow, City University of Hong Kong
Hong-Zhou Tan, University of Manitoba
Yong Fang, Shanghai University
J. Webster (ed.), Wiley Encyclopedia of Electrical and Electronics Engineering Online
Copyright © 2001 by John Wiley & Sons, Inc. All rights reserved.
Article Online Posting Date: December 20, 2001

Content :

• Top Of Article
• Input-Output System Representation
• Nonlinear Differential Algebraic Representation
• Volterra Representation
• State-Space Representation
• Bilinear Representation
• Narma Representation
• Fuzzy-Logic Nonlinear Representation
• Nonlinear Representation Using Neural Networks
• Model-Free Representation
• Features Of Nonlinear Representations
• Example
• Concluding Remarks
• Acknowledgment

Free Download eBook : NONLINEAR SYSTEM REPRESENTATION

This is a manuscript for a PLC based control system book that is currently being used for teaching an undergraduate controls course EGR 450 - Manufacturing Controls. The course and book focus on the Allen Bradley family of controllers, thus allowing a deeper topic coverage than is normal in PLC books.

Status

Versions 5.0 and newer of the book are updated to focus on the Allen Bradley ControlLogix controllers. The older book focuses on the PLC-5 and Micrologix platforms and can be found on a copy of the previous page.

A Free Book

Please note that the book is available under the GFDL (GNU Free Document License). This permits copying, distribution, modification, etc. without my permission, within the terms of the license.

Interesting facts

Between May 6 and August 22, 2003 the book was downloaded 88973 times from the main website. This does not include downloads from other websites that have copies of the book. It also does not include copies downloaded over the previous years. On August 21, 2003 the book was downloaded 563 times. In the same time period individual chapters were downloaded in PDF and RTF formats 88086 times. Most interestingly is that the PLC book webpage was only accessed 14001 times. This suggests that people have created links, or are using external links to access the book directly.

Downloads

• Version 5.2 (newest) available at the book web site September 30, 2008
• Version 5.1 PDF (6MB) April 21, 2008
• Version 5.0 PDF (6MB) May 5, 2007
• Version 4.9 PDF (6MB) January 12, 2007
• Version 4.7 PDF (5.4MB) April 14, 2005
• Version 4.6 PDF (5.3MB) December 15, 2004
• Version 4.5 PDF (5MB) May 5, 2004
• Version 4.2 PDF (5MB) April 3, 2003
• Version 4.1 PDF (5.0MB) July 22, 2002
• Version 4.0 PDF (4.9MB) March 31, 2002 (HTML)
• Version 3.1 PDF (4.7MB) November 27, 2001
• Version 3 PDF (4.7MB) July 12, 2001
• Version 2 PDF (4.5MB)

Resources

• Labguide PDF - updated April 21, 2008
• Chapters and Powerpoint slides

Other Stuff

• Links
  • More online books books
  • EGR 450 - A PLC controls course
  • An open source PLC for Linux
  • An online PLC tutorial
  • A general information and discussion site with ladder logic to download
  • A publisher with another PLC book on-line
  • A general information PLC site
  • Tools for analysis of PLC based control systems Tek Supply
  • A site dedicated to communications Data Transfer HQ
  • PLC maintenance and safety - Business Industrial Network

(C) 1996-2008 Hugh Jack, ABSOLUTELY NO WARRANTY