BIPOLAR AND UNIPOLAR TRANSISTOR

Transistor is the electronic component consists of 3 layers of semiconductors, such as NPN and PNP. The transistor has three legs that called the Emitter (E), base/Base (B), and the collector/Collector (C). A transistor can serve some sort of tap electrical, where based on the current input (BJT) or voltage input (FET), allows a very accurate power stream from the source of electricity.

 

Figure 1-1 Example of Transistor

 

transistor symbol is as follows:

 

Figure 1-2 Symbol of Transistor

 

Tansistor has many functions, but in general the Transistor functioning as follows:

a. As the amplifier current, voltage and power.

b. as a rectifier.

c. as a mixer.

d. As an oscillator

e. As circuit breaker and transition (Switching).

 

TRANSISTOR TYPES

The current of the transistor has many types, but at first there are two basic types of Bipolar Junction Transistors (BJTS) and Field Effect Transistors (FETS) that each work berbed

 

bipolar Transistor (BJT)

Bipolar transitors are so named because main conduction channel uses two polarity of charge carriers: electro and holes, to carry an electric current.

The workings of the BJT can be dibayang as the two diodes are positive or negative teminal attached each other, so that there are 3 terminals, namely the base (B), (C), collector and Emmitter (E).

Changes in electrical current in small quantities at base terminal can menghasilakn changes a large amount of electrical current at the terminals of collectors. This is the principle underlying the use of transistor as an amplifier electronics. The ratio between the flow collector current at the base are usually symbolized β or hFE. β is usually ranges from about 100 to transistor-transistor BJT.

unipolar Transistor (FET)

Unipolar transistors (FETS) using only one type of charge carriers (electrons or holes, depending on the type of FET). In FETS, an electric current flows in one main Canal with narrow depletion zone conduction on both sides (compared with the bipolardimana transistor the base region cut direction main lidtrik currents). And the thickness of the border area can be changed with the change of the given voltage, to change the thickness of the conduction channel.

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