Digital Electronics

http://users.senet.com.au/~dwsmith/beginners.htm http://en.wikipedia.org/wiki/Digital_electronics http://bwrc.eecs.berkeley.edu/Classes/IcBook/ http://www.arrl.org/files/file/Courses/intro-013.pdf http://online.physics.uiuc.edu/courses/phys405/fall05/

http://www.asic-world.com/digital/tutorial.html http://www.physics.utoronto.ca/workshop/bbelectronics/ http://www.ee.ic.ac.uk/hp/staff/dmb/courses/dig2/dig2.htm