The P-doped layer in NPN transistor represents the base terminal and the other two n-doped layers represent emitter and collector terminals which are negative.Īlso, this base terminal controls the number of holes in the PNP transistors, as holes are majority carriers in PNP transistors. Recall, in NPN transistor the positive voltage supply is applied at the base terminal. The base terminal behaves like a control valve that controls the number of electrons emitted from the emitter terminal which are then collected by the collector terminal that is coupled with a resistor to control the electrical current. The overall transistor action starts from the base pin. The following figure is the diagram of D882 pinout. Video: How check D882 transistor with maltimeter || AV ELECTRONICAL Catalog
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