Transistors

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                   The transistor's function is to amplify an electric current.Many different kinds of transistors are used in analog circuits, for different reasons. This is not the case for digital circuits. In a digital circuit, only two values matter; on or off. The amplification ability of a transistor is not relevant in a digital circuit. 


          
              Transistors are often used in digital circuits as buffers to protect I.C's. A voltage or current applied to one pair of the transistor's terminals changes the current flowing through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal.

Two different symbols are used for the transistor.

P.N.P type and N.P.N type


Appearance of the Transistor



  
Pin-Out Details Of Some Transistors:

        Transistors are manufactured in different shapes but they have three leads. BASE - which is the lead responsible for activating the transistor. COLLECTOR - which is the positive lead. EMITTER - which is the negative lead.



 




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