![]() It controls voltage or current flowing through it. It is similar to two diodes joined back to back. Depending on the type of transistor it is used for different applications. Note: A transistor is a fundamental unit of all the electronics used in our daily life. Field Effect Transistor (FET): These are voltage controlled devices. Bipolar Junction transistors (BJT): Provides high output current for small input current.Ĭ). Phototransistors: Transistors in which current flow depends on the amount of light incident on it.ī). The term originally was applied to the study of electron behaviour and movement, particularly as observed in the first electron tubes. Electronics encompasses an exceptionally broad range of technology. Transistors are used for amplification purposes.ĭifferent types of transistors are available in the market.Ī). A graphene field effect transistor (GFET) is composed of a graphene channel between two electrodes with a gate contact to modulate the electronic response of. electronics, branch of physics and electrical engineering that deals with the emission, behaviour, and effects of electrons and with electronic devices. Transistors are used as electronic switches. Depending on the type of impurities added, the semiconductor will become p-type or n-type. Out of three terminals one terminal of the transistor is always common to input and output. Doping is the method of adding impurities to the semiconductor material. A transistor is generally made up of Silicon or germanium. If N-type semiconductor material is sandwiched between two P-type semiconductor materials then it is called a PNP type transistor. If P-type semiconductor material is sandwiched between two N-type semiconductor materials then it is called NPN type transistor. It is a three layer semiconductor device where a P-type (or N-type) semiconductor material is sandwiched between two N-type (or P-type) semiconductor materials. The result of efforts to replace inefficient and bulky vacuum tubes in current regulation and switching functions. A transistor stands for ‘transfer (=trans) of resistor (=istor)’. Arguably the most important invention of modern times, the transistor was invented in 1947 at Bell Labs by John Bardeen, William Shockley, and Walter Brattain.
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