Transistors are three terminal active devices made from different semiconductor materials that can act as either an insulator or a conductor by the application of a small signal voltage. The fusion of these two diodes produces a three layer, two junction, three terminal device forming the basis of a Bipolar Junction Transistor, or BJT for short. If we join together two individual signal diodes back-to-back, this will give us two PN-junctions connected together in series which would share a common Positve, (P) or Negative, (N) terminal. The bipolar transistor uses one more layer of semiconductor material to produce a device with properties and characteristics of an amplfier. Unlike semiconductor diodes which are made up from two pieces of semiconductor material to form one simple pn-junction.
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