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TRANSISTORS TYPES OF TRANSISTORS • • • • • PNP TRANSISTORS NPN TRANSISTORS FIELD EFFECT TRANSISTOR ( F.E.T ) UNI JUNCTION TRANSISTOR ( U.J.T ) SILICON CONTROLLED RACTIFIER ( S.C.R ) CONSTRUCTION TRANISTOR IS A CONNECTION OF TWO DIODES. •PNP TRANSISTOR :- N TYPE SEMI CONDUCTOR SANDWICH BETWEEN TWO P TYPE SEMI CONDUCTORS. •NPN TRANSISTOR :- P TYPE SEMI CONDUCTOR SANDWICH BETWEEN TWO NTYPE SEMI CONDUCTORS. • PNP & NPN TRANSISTOR HAS THREE TERMINAL ( NEXT PAGE ) • TERMINALS NAME ARE EMITTER, BASE & COLLECTOR • PNP & NPN TRANSISTOR ARE BIPOLAR TRANSISTORS (BJT) • TRANSISTOR IS SEMI CONDUCTOR DEVICE • TRANSISTOR MAKE FROM SILICON & GERANIUM SEMI CONDUCTOR MATERIAL FIELD EFFECT TRANSISTOR • F.E.T HAS THREE TERMINALS • THESE TERMINAL KNOWN AS GATE,DRAIN & SOURCE. • F.E.T IS UNI POLAR TRANSISTOR UNI JUNCTION TRANSISTOR • UJT HAS THREE TERMINALS • THESE TERMINAL KNOWN AS BASE 1, BASE 2 & EMITTER • U.J.T IS UNI POLAR TRANSISTOR SILICON CONTROLLED RACTIFIER • S.C.R HAS THREE TERMINALS • THESE TERMINAL KNOWN AS ANODE, CATHODE & GATE • S.C.R IS UNI POLAR TRANSISTOR. WORKING OF TRANSISTOR • PNP & NPN TRANSISTOR HAS TWO JUNCTION, EMITTER BASE JUNCTION & COLLECTOR BASE JUNCTION • F.E.T,S.C.R,U.J.T HAS ONE JUNCTION CURRENT FLOW IN FROM ONE JUNCTION & DIRECTION APPLICATION OF TRANSISTOR • AMPLIFIER • SWITCH • CONTROLLED PROCESS
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