Contents
How do you know what transistor to use?
When choosing a transistor to use as a switch you need to consider its maximum collector current Ic(max) and its minimum current gain hFE(min). Transistor voltage ratings may be ignored for supply voltages less than 15V.
Why use transistor in circuit?
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. Transistors are one of the basic building blocks of modern electronics. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal.
What can you do with a transistor in a circuit?
The transistor is a simple component that you can use to build a lot of fun projects. In this hands-on guide, you’ll learn how transistors work so that you can use them in your next circuit. It’s actually pretty easy, once you learn the basics.
How is the current of a saturated transistor determined?
When a transistor is saturated the collector current Ic is determined by the supply voltage and the external resistance in the collector circuit, not by the transistor’s current gain. As a result the ratio Ic/I B for a saturated transistor is less than the current gain h FE.
How are the terminals of a transistor made?
A transistor is made by sandwiching a p-type region between two n-type regions, and vice versa. NPN and PNP are the two types of transistors, based on their internal structure. The three terminals of a transistor originate from each of the three doped regions present inside it. The middle zone is the base terminal,
How does a transistor switch off the collector current?
The transistor amplifies this small current to allow a larger current to flow through from its collector (C) to its emitter (E). This collector current is large enough to make LED C light brightly. When the switch is open no base current flows, so the transistor switches off the collector current.