Different states: cut-off, active/amplifying, and saturation

• devry.ca's EET225 discription of active, saturated, and cutoff states
• Chapter 8, Bipolar transistors (common base, common emitter, common collector)
• hyperphysics: three modes

Transistor as Switch (eg. saturation and cut-off modes)

• MIT freeserve
• hyperphysics, common emitter switch, emitter follower switch
• allaboutcircuits.com
• rason.org