In this tutorial, we are going to learn about which types of transistors use in circuit.
What is Transistor?
Itis a semiconductor device which is used to amplify & also use as a switch electronic signal and electrical power. A transistor is a semiconductor material which has three terminals for connection to an external circuit. In transistor can be applied in form as voltage or current to one pair of the transistor’s terminals controls the current through another pair of terminals. Due to the controlled power could be higher than the controlling power; a transistor can amplify a signal. Now days many transistors are packaged individually, but more are found embedded in integrated circuits.
Below are the lists of transistors which are used in circuit.
Transistor BC547- It is an NPN bi-polar junction transistor which is used for transfer of resistance & mostly it is used to amplify current. When give very small current at its base controls then can control a large current at collector & emitter terminals. BC547 have equivalent transistors which are BC548 and BC549.
Transistor BC548- It is a same as BC547 & it is a general purpose NPN bipolar junction transistor which is mostly used in all types of electronic equipment. This is a NPN transistor, in this the collector and emitter will be left open in case the base pined is hold at ground and will be closed.
Transistor BC557– It is a PNP transistor there is the collector and emitter will be closed this is called forward biased when the base pined is hold at ground and it will be opened this is called Reverse biased when a signal is provided to base pin.
Transistor BC558- It is a PNP family-based on bipolar junction transistor, used in switching & amplification-based applications. This includes three terminals that are collector, base & emitter which are dissimilar in terms of doping concentrations, functions, and size.