http://www.techlib.com/electronics/colorcode.html
http://landau1.phys.virginia.edu/classes/241L/transist/transold.htm
Use the exercises to practice the concepts of Basic Electronics. This is a fun way to master circuit analysis. An electronics tutorial.
http://www.twysted-pair.ca/
can produce high speed output signals with fast rise and full times.
http://www.imagineeringezine.com/PDF-FILES/pushpul.pdf
http://www.doctronics.co.uk/meter.htm
PCB tips and RF tips.
http://www.al-williams.com/wd5gnr/tips.htm
http://hem.passagen.se/sm0vpo/begin/bias-00.htm
for Linear Power Transistors
http://www.mrs.bt.co.uk/dubus/9004-7.pdf