TRANSISTORS TYPES OF TRANSISTORS PNP TRANSISTORS NPN TRANSISTORS

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