Bipolar junction transistor (BJT) structure A transistor is a semiconductor device with 3 terminals which are collector, emitter and base. So identification of the 3 pins of a transistor is an essential part when using transistors for circuits. Transistors are made of semiconductor materials mainly silicon and some are made out of germanium and other … Continue reading How to Identify the 3 Pins of a Transistor correctly: Transistor Testing Methods in Step-by-step