National Science Digital Library
NSDL was established by the National Science Foundation (NSF) in 2000 as an online library which directs users to exemplary resources for science, technology, engineering, and mathematics (STEM) education and research.
Electronics EE
electronics library free technical online directory dedicated to research and devellopment and science advances for all engineers working in the electronics and electrical industry including papers thesis docs publication.
The Hardware Book - HwB
HwB: The Hardware Book (Mirror)
Provides circuits, pinouts, cable and adapter descriptions plus other technical information. Hardware Book. Internet's largest free collection of connector pinouts and cable descriptions
Educypedia - the educational encyclopedia
An information resource about electronics, computer, scientific and educational material.
Educypedia is an information resource about scientific and educational material: electronics, science, engineering, encyclopedia and information technology. All the links are tested with respect to content, no commercial links.
Educypedia is the most complete encyclopedia in the world: with only one mission: providing people what they really need.
Electronics Circuits, Schematics, PCB, Product Design and Projects Search Engine.
