The Hardware Book
- A collection of connector pinouts, cable and other hardware features, electronic circuits and tables.
- http://www.hardwarebook.info/

Electronics 2000
- Electronics technical data, interactive calculators, software downloads, forum, a beginners guide and links.
- http://www.electronics2000.co.uk/

Agilent Educator's Corner
- Electrical engineering insight, interactive experiments, lecture assistance, reference materials, teaching tools, student resources, research materials.
- http://www.home.agilent.com/agilent/industry.jspx?nid=-35640.0.00

Williamson Labs Electronic Tutorials
- A collection of tutorials on electronics, from the basics to university level.
- http://www.williamson-labs.com/

Circuit Exchange International
- Electronic and radio schematics; circuit analysis, design and theory; freeware and shareware downloads.
- http://www.zen22142.zen.co.uk/

PCB Systems
- Technical publications articles about laypout and analysis of the physical, practical side of RF PCB design.
- http://www.mentor.com/products/pcb/techpubs/

High Frequency Electronics
- An online and paper journal with information on analog, digital, RF, microwave, millimeter-wave and lightwave technologies.
- http://highfrequencyelectronics.com/

Microwaves and RF Magazine
- Articles and technical information about higher frequency RF.
- http://www.mwrf.com/

Scotts Guide to Electronics
- An elementary guide to Electronics. Learn about components, circuits, and the use of electronics.
- http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm

Electronics Data Book
- A near complete reproduction of Allied Electronics Handbook. Electronic formulas and charts.
- http://www.qsl.net/wa7zcz/disc.html

RF Avenue Wireless Resources Directory
- A collection of RF and microwave resources for wireless communication engineers. Includes tutorials, theory, design aids, circuit diagrams and products.
- http://www.newwaveinstruments.com/resources/rf_microwave_resources/digital_wireless_communication_directory.htm

Applied Radio Labs Design File
- Technical articles and files on RF, radio and phase lock loops (PLL).
- http://www.radiolab.com.au/DesignFile1.htm

Spread Spectrum Magazine
- Technical reference section. Mostly RF technical articles.
- http://sss-mag.com/reftopics.html

Lessons In Electric Circuits
- A six-volume set of free downloadable books covering many aspects of electricity and electronics. Suitable for 2-year college use.
- http://www.ibiblio.org/obp/electricCircuits/index.htm

Don Lancaster Lair
- Tutorials, resource bin, ezine columns, InfoPacks, annotated links.
- http://www.tinaja.com/

Mil Spec Documents and Drawings
- Index and copies of many military specifications, drawings and handbooks.
- http://www.dscc.dla.mil/Programs/MilSpec/

Learn Electronics Tutorials and Information Pages
- Tutorial in basic electronics, dictionary of electronics terms, circuit analysis puzzles.
- http://www.twysted-pair.com/

Conformity Magazine
- Electrical engineering trade magazine with information on EMC design, a series of articles on Maxwells Equations, and an archive of past articles.
- http://www.conformity.com/

Input-Data Acquisition System Design for Human Computer Interfacing
- A tutorial on the theory and design of various types of sensors for Man-Machine interface.
- http://www-ccrma.stanford.edu/CCRMA/Courses/252/sensors/sensors.html

Prototyping Circuits
- All sorts of information about prototyping electronics circuits, hints kinks and tutorial are included.
- http://www.efplus.com/techref/tools.htm

RADAR Handbook
- Equations, data, EW stuff, theory and information. An extensive source of all types of information.
- https://ewhdbks.mugu.navy.mil/contents.htm

Marc's Technical Pages
- Features electronic ideas, circuits, and hints including radio, antennae, and articles.
- http://www.marcspages.co.uk/

Technical Library
- Information for the electronics experimenter from Wenzel Associates.
- http://www.techlib.com/contents.html

PlanetEE Portal
- Ideas for design, reference, education, careers, events, Bob Pease column, discussion forums, products, literature. Registration requred.
- http://www.planetee.com/

DigitalFilter.com
- Java Applets and Windows Applications to design/analyze digital filters, tutorials on digital signal processing, schematics.
- http://www.digitalfilter.com/

Design Notes
- Design engineering information and resource site for engineers, students and hobbyists.
- http://www.designnotes.com/

The RF CAFE
- A collection of links to various application notes for different RF Vendors. Links to RF equations, technical data sheets, math notes, design ideas and useful RF design information.
- http://rfcafe.com/

Technology Interface Home Page
- A technology educational journal.
- http://web.bsu.edu/tti/index.html

TechOnLine.com
- An online electronics university. Take short and informative online courses in Electronics. Short and practical courses.
- http://www.techonline.com/

RadioRegs.com
- Information regarding European radio and telecommunications equipment regulations, including what designers need to know when designing radio equipment
- http://www.radioregs.com