Electronics/Transistor

Transistor
How Does a Transistor Work? - YouTube - http://www.youtube.com/watch?v=IcrBqCFLHIY

How to Connect a Transistor in a Circuit for Amplification - http://www.learningaboutelectronics.com/Articles/How-to-connect-a-transistor-in-a-circuit-for-amplification

Basic Transistor Circuits - http://www.pcbheaven.com/wikipages/Transistor_Circuits/

Transistors 101 - http://sunburst.usd.edu/~schieber/psyc770/transistors101.html

http://www.bbc.co.uk/schools/gcsebitesize/design/images/el_transistor_leads.gif

NPN easy remember - not pointing in

NPN, looking at flat edge, left pin is collector (+), center is base, and right is emitter (-)



2N2222 NPN transistor

http://www.elprocus.com/wp-content/uploads/2013/01/NPN.jpg

http://www.elprocus.com/wp-content/uploads/2013/01/PNP.png

Darlington pair
"A single bipolar transistor cannot have both high gain and high collector current. A Darlington pair is a special arrangement of bipolar transistors that combines a high-gain transistor with a high-current transistor. The combined transistors allow both a higher gain and a larger amount of current to flow than would be possible with a single transistor. Darlington pairs are often used to drive motors. They can be bought packaged as a single discrete component or packaged as a transistor array, consisting of several transistors in a single integrated circuit (IC) (such as ULN2803 and ULN2003)." 

http://www.bbc.co.uk/schools/gcsebitesize/design/images/sc_darlington_pair.gif