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

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• 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