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TRANSISTOR

What is a transistor:A transistor is a 3 terminal electronic device made of semiconductor material.

Transistors have many uses, including amplification, switching, voltage regulation, and the modulation of signals

TRANSISTOR: Transistor is very common component this use in every circuits.

TYPES OF TRANSISTOR: Transistor is two types 1 pnp positive negative positive,2 npn negative positive negative !

HOW IT WORKS: This works like liver

Back To The Question HOW TO WORKS Transistor:Bipolar Junction Transistors

NPN Transistor Most Common Configuration Base, Collector, and Emitter

Base is a very thin region with less dopants

Base collector jusntion reversed biased

Base emitter junction forward biased

Fluid flow analogy:

If fluid flows into the base, a much larger fluid can flow from the collector to the emitter

If a signal to be amplified is applied as a current to the base, a valve between the collector and emitter opens and closes in response to signal fluctuations PNP Transistor essentially the sameexcept for directionality 

BJT Transistors:BJT (Bipolar Junction Transistor) npn

                         Base is energized to allow current flow pnp

                         Base is connected to a lower potential to allow current flow

                                                 3  parameters of interest Current gain (β) Voltage drop from base to emitter when VBE=VFB Minimum voltage drop across the collector and emitter when transistor is saturated 

BJT	FET
Collector	Drain
Base	Gate
Emitter	Source
N/A	Body

FET Transistors   1:Analogous to BJT Transistors FET Transistors switch by voltage rather than by currenT

                           2:FET (Field Effect Transistors) MOSFET (Metal-Oxide-Semiconductor Field-Effect                         Transistor) JFET (Junction Field-Effect Transistor) MESFET HEMT MODFET Most common are the n-type MOSFET or JFET