From: pchung705@gmail.com   
      
   Even though mechanisms that makes bipolar transistor run are quite complicated   
   and  there are many side effect to be covered, simple analysis is possible   
   with two simple models: one for active regime, when we use one independent   
   voltage source to model    
   base-emitter p-n junction and one current controlled current source to model   
   collector-emitter junction. Another is model of bipolar transistor that takes   
   only two independent voltage sources. Read more.   
      
   http://www.cirvirlab.com/index.php/electronic/52-bipolar-transistor.html   
      
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