Learning
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This list is an ever-growing collection of free online learning resources that may be helpful for many people in the hackerspace community.
Electronics
All About Circuits - Covers DC, AC, semiconductor, and digital electronics
Digital Signal Processing
The Scientist and Engineer's Guide to Digital Signal Processing - Authoritative online book covering DSP in breadth and in depth
Miscellaneous
Khan Academy - Anything and Everything
How Stuff Works - Simplistic and terse explanations of everyday items