Transistor is an essential component is almost every electronic circuit like: Amplifiers, Switching, Oscillators, Voltage Regulators, Power Supplies and most importantly, the Digital Logic ICs.įrom the time of invention of the first transistor to the present day, transistors are classified into different types depending either on their construction or their operation. The Transistor is one of the important active components (a device which can produce an output signal higher power than that in the input signal). Transistors are small in size and it requires low energy for operation and also it has low power dissipation. Since a long time, the vacuum tubes are replaced with transistors because the transistors have more benefits over vacuum tubes.

A Transistor is a three terminal device and a small current / voltage at one terminal (or lead) will control a large flow of current between the other two terminals (leads). Transistor is a semiconductor device which is used to either amplify the signals or to act as an electrically controlled switch. JFET (Junction-Field Effect Transistor).

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