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Finding electronic components and specifications
Includes lots of tutorials and the Reference Design Library search engine as well as a huge catalog of parts with spec sheets.
Searches across many distributors to find electronic components. You can search by specification as well.
Octopart: prototyping library
A library of common prototyping parts, with many links to projects and more information.
Lots of information on choosing components, plus lots of small project ideas.
Search for electronics components across manufacturers.
More resources for designing and making stuff
Librarian for Electrical Engineering & Computer Science