Post date: Apr 29, 2015 1:59:34 AM
https://arduinodiy.wordpress.com/ Very well documented Blog about electronic and Arduino digging a bit more in the theory.
http://embedded-lab.com/blog/?page_id=23 An online teaching laboratory for Microcontrollers and Embedded Systems
https://learn.sparkfun.com/?_ga=1.185165993.1025952575.1428574441 classes and online tutorials to help educate individuals in the wonderful world of embedded electronics.
http://www.instructables.com/ a mine of information about DIY stuff
https://learn.adafruit.com/ Very good source of information about electronic and microcontrollers
http://kaizerpowerelectronics.dk/ Some interesting calculator
http://www.electronics-tutorials.ws/ Basic electronic tutorial
http://www.talkingelectronics.com/te_interactive_index.html Tons of electronic circuit. you can downloads pdf books (free)