HOW TO USE TRANSISTOR

Use a transistor as amplifier

AMPLIFIER: An amplifier has two input and two output terminals, so a
three terminal transistor used as an amplifier must have
one of its terminals common to both input and output as
shown (left). Which terminal is used as the common
connection has a marked effect on the performance of the
amplifier.
These differences can be exploited by the circuit designer
to give and amplifier that most suits a particular purpose.
In common emitter small changes in base emitter current cause large changes in collector emitter
current. The circuit is that of a CURRENT amplifier. For VOLTAGE amplification, we connect a load
resistor (or an impedance such as a tuned circuit) in the collector circuit so that the change in collector
current causes a change in the voltage across the load resistor. The value of the load resistor will
affect the VOLTAGE GAIN of the amplifier.

In COMMON COLLECTOR (emitter follower) mode the transistor is normally used as a BUFFER
AMPLIFIER for matching impedances between two other circuits. This mode gives the amplifier high
input impedance and low output impedance. The voltage gain is unity (1). It is a useful CURRENT
AMPLIFIER and is often used for driving high current devices such as motors etc.

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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