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1800-102-2727A transistor is a semiconducting device that amplifies or switches electronic signals and electrical power. They are the building blocks of modern electronic gadgets and technology. They regulate current by amplifying the input current to a more significant output current. Various applications of a transistor include-
1. Usage in logic gates, flip-flops circuit
2. The memory card in smartphones
3. Transistors act as switches for various modern gadgets like smartwatches, computers, laptops, etc.
4. Microcontrollers and microprocessors
5. Register circuits
A transistor consists of a p and n diode – positive and negative. Thus, Moore’s law is followed, or we can say Moore’s law is the rule of the transistor. Moore’s law observes that the number of transistors in a dense integrated circuit (IC) doubles every two years.
Whatever be the configuration, transistor characteristics are represented by the graph of current vs. voltage of a transistor. These configuration circuits, if are two-port network, can be analyzed using the following characteristic curves-
A transistor can be placed on the electrical circuit in three configurations – common emitter transistor, common base transistor, and common collector transistor, also known as an emitter follower. The connection of the transistor terminal determines these three configurations.
We place a common emitter terminal transistor between the input and output terminals in the common-emitter configuration.
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In the common base configuration, the common base terminal of the transistor is connected between the input and output terminals.
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In common collector configuration, the common collector terminal of the transistor is connected between the input and output terminals.
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Ques 1: What is the difference between transistors NPN and PNP? What are the applications of these transistors?
Ans: NPN and PNP transistors are made up of various materials. Therefore, the current passing through these transistors is also different.
1. In a PNP transistor, the current flows from the emitter to the collector, whereas in a transistor, the current flows from the collector to the emitter.
2. In a PNP, there are two layers of P-type material and one layer of N-type material. In an NPN transistor, there are two layers of N-type material and one layer of P-type material.
3. In a PNP transistor, a positive voltage is applied across the emitter terminal to produce the flow of electric current from the emitter to the collector. In an NPN transistor, the positive voltage is applied across the collector terminal to produce the flow of electric current from the collector to the emitter.