Learnabout Electronics

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Electronics For All


Already one of the most popular on line electronics education sites, with around 300 pages and over 1700 illustrations and animations on a wide range of electronics topics, Learnabout Electronics has grown into a major international educational site, used by millions of independent learners, major educational publishers, armed forces training establishments as well as colleges and universities all over the world. Used for electronics classes, Learnabout Electronics also links to selected electronics industry sites worldwide for further information. Learn on line, or download whole learning modules to print and keep. Just look for the pdf symbol at the top of many of our learning modules.

For Teachers

Step by Step

Learnabout Electronics is designed to take your students one stage further in an interesting and informative way, with information suitable for students studying on a wide range of electronics courses, anywhere a practical understanding of electronic components and circuits is needed, with interactive animations and digital simulations useable on a wide range of devices and screen sizes. Learnabout Electronics will provide useful support material for advanced students, as well as key information for students new to electronics.

For Students


Learning about electronics? Then you need to know about components; on our site you will find full and easy explanations of many common types. Check out our animated diagrams to make transistor operation clear. Find out the right way to test transistors in our Fault Identification Section and get help with those maths problems you need when starting out in electronics.

Step by Step

Step by Step

Check out our unique Step by Step learning modules. Each one starts with "What you need to know", then takes you from basic information on your chosen topic, step by step through to more complex knowledge and understanding. At the end of each module a short quiz helps you check what you have learned. A paper version of every module is also free to download to print and keep. Nothing to pay! No need to Log in. Try it!


Learn About Electronics grows and grows!

Learnabout-electronics continues to grow with new topics and new modules being developed continually. The aim of the site remains constant however. To provide the best possible on-line learning experience, freely available to all.

Much of the success of learnabout-electronics is due to the invaluable input from users around the world who have contacted the site with suggestions, corrections and comments via our Contacts page.

new splash

The Learnabout-Electronics Site is Changing

resistors on tablet

As more of our pages are redesigned to make them useable on mobile devices as well as desktops, our menus have also changed

All the pages you have used before can still be accessed with no more than 3 clicks from the main menu bar at the top of every page.

If you already have bookmarks to our old pages, don't worry, you will automatically be re-directed to the new version of that page. (Don't forget to update any old bookmarks.)

Resistors & Circuits

Resistors & Circuits

Learn the basics of electronics - Ohm´s Law, simple circuits and resistor networks - both series and parallel explained step by step.

All the essentials; voltage current, conductance and resitivity explained. How does temperature affect resistance? Its all here, together with component recognition for 4, 5 and 6 band coded resistors as well as SMT codes and simple fault finding.

Some of the most comprehensive resistor data on the web!

AC Theory

Our pages about AC components and circuits are designed to teach the basics of AC Theory in 11 easy to learn modules. Use them as a complete course, or study any individual topic, including capacitors, inductors, reactance, impedance, waveforms and phasors.

understanding phasors

Every module is backed up with a paper version to download, print and keep. The online pages also use interactive animations, adding to our popular transistor animations that are now among the most sought after diagrams of their type on the web.



Learn how to design and build a working transistor amplifier with the minimum of maths theory. Amplifier classes explained from A to D, together with multistage amplifiers, practical power amplifiers and op amp circuits. Get to grips with negative feedback, input impedance and bandwidth control. Everything from basic amplifier facts to complex professional designs is here on Learnabout Electronics.


transistor animation

Learning about electronics? Then you need to know about components, including diodes, FETs, bipolar transistors, thyristors triac ans diacs, opto-coupled devices and basic semiconductor theory.

Find full and easy explanations of many common types. Check out our animated diagrams to make transistor operation clear. What´s the difference between common emitter, common base and common collector connections? Find out the right way to test transistors in our Fault Identification Section and get help with those maths problems you need when starting out in electronics.


Sine wave, square wave, transistor, op-amp and IC oscillators play a vital role in most electronic systems. How oscillators work and what they do. Radio frequency and audio frequency circuits, astables, monostables and pulse width modulation are all here in our popular learnabout modules.


Learn about oscillators step by step, or choose any module and learn just what you need to know, including how to design and build working circuits for yourself. How to test oscillators, plus links to relevant electronics industry oscillator data!

Power Supplies

Every circuit (just about) needs a power supply, so you need to know how power supplies work. Learnabout these vital circuits - everything from Basic Rectifiers to Switched Mode Supplies, and from basic components to integrated circuits - all in our easy to learn modules.

simple to complex PSUs

The power supply modules are also extensively linked to key pages with detailed information and basic terms you need to be familiar with. Use the power of learnabout-electronics’ hundreds of pages of electronics information to guide you through the stuff you need to know, and important data sheets on power supply components are also just a click away to link you to manufacturers data. Start learning real circuits now with Learnabout Electronics.

Digital Electronics

digital circuits.gif

Now you can learn-about Digital Electronics with FIVE MODULES packed with information and circuits on digital technology! Start with binary arithmetic - Boolean Algebra, Karnaugh Maps, all the essentials you need to know. Step by Step instructions for simplifying Boolean expressions, plus FREE TO DOWNLOAD software to make simplifying Boolean a breeze!

Logic Gates, logic families and digital circuits explained, from basic gates to the highly complex circuitry that make computers work, learn how they work step by step. Multiplexers, adders, counters, shift registers and more. Download free Logisim software and over 60 interactive simulations of common digital circuits.

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