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Transistor as a Switch Theory

Transistor as a Switch Theory

In the following circuit, the transistor acts as a switch, in the same way, that a relay works. The advantage of a transistor to a relay is that a transistor is lighter, has less noise (if any at all), has no moving components, it is faster, consumes less energy and …

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Switching and Amplification of Transistor

Switching and Amplification of Transistor

Two principal functions of a transistor are switching and amplification. In order to better understand what is meant by switching and amplification, we examine the following two examples. Switching Function Suppose that the current in a motor when working is 30 A. Dissimilar to a household device that you turn …

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Transistor | Basics | Modes of Operation | Biasing

Transistor | Basics | Modes of Operation | Biasing

A transistor is a semiconductor device with many applications. It is, in fact, the mother of all the other semiconductor electronic devices that we use or see around us today. Before transistors were invented, all electronic devices were made with vacuum tubes. Still one can find devices such as stereo …

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Diac & Triac | Basics | Characteristics Curve

Diac and triac are two devices, usually used together for current control in AC circuits. The names are made based on “diode for AC” and “triode for AC.” Although you now know about solid-state diode, the counterpart of that in vacuum tubes was also called diode; a tube with two …

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Diode | Working Principle | Construction

diode symbol

Definition: A diode is the simplest semiconductor component. It is made of only two pieces from different semiconductor materials. Nonetheless, you may find diodes in almost all electronic circuits. Diode Working Principle Its function is to let electric current flow in one direction but to prevent flow in the opposite …

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Diode Characteristic Curve Explanation

Diode Characteristic Curve

A typical characteristic curve for a diode is shown in Figure 1. This curve shows the variation of the diode current versus the voltage across the diode. On the right-hand side of the vertical axis (the current axis), a diode is forward biased because the voltage applied across it is positive. …

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Integrated Circuit (IC) | Construction, History & Types

integrated circuit definition

Definition: An integrated circuit, or IC, is a complete electronic circuit contained in one package, Figure 1. This package often includes transistors, diodes, resistors, and capacitors along with the connecting wiring and terminals. An IC is also called a chip. The transistor was invented in 1947 by Brattain, Bardeen, and …

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Common Emitter Amplifier: Working & Circuit Diagram

Common Emitter Amplifier

Amplifier Definition: An amplifier is an electronic device that uses a small input signal (voltage or current) to control a larger output signal. This principle works best when the output load, or impedance, of the circuit, is greater than the input load. Examine Figure 1. The input is a microphone …

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NPN Transistor Working Principle

PNP-and-NPN-transistor

The scientists John Bardeen and Walter Brattain invented the point-contact transistor. It had two wires carefully fused on a crystal of germanium. William Shockley followed these inventions by creating the bipolar, or junction, transistor. These inventions were the beginning of microelectronics. The transistor provided instant circuit operation and eliminated the …

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