An Amplifier or Amp is an electronic device that is built to increase the power and stability of a signal (a time-varying voltage or current).
Amplifiers consists of a two-port electronic circuit that uses electric power from a power supply to increase the amplitude of a signal applied to its input terminals, producing a proportionally greater amplitude signal at its output.
Amplification is the method of enhancing the signal strength of any electronic device.
Almost all electronic equipment have some means of amplifying their own signals. The use of amplifiers can be found almost every where; in medical devices, scientific equipment, automation, military instruments, communication instruments, industries and even in home machineries.
In History, The first practical device that could do the work of amplification was the Triode Vacuum Tube, which was invented in the year 1906 by Lee De Forest, and later led to the first amplifiers in the year 1912. At that time, Vacuum tubes were used in almost all amplifiers up till the 1970s and later replaced by transistors. Today, most amplifiers use transistors, but vacuum tubes still continue to be used in some applications.
There are 3 major categories of amplifiers:
1. Voltage Amplifier
2. Current Amplifier
3. Power Amplifier
1. Audio Frequency Amplifiers (A.F. Amplifiers): A.F. Amplifiers are used to supply audio frequency power for the loud speakers.
2. Intermediate Frequency Amplifiers (I.F. Amplifiers): I.F Amplifiers are used in TVs, radios and radar broadcast.
3. Radio Frequency Amplifiers (R.F. Amplifiers): R.F Amplifiers are used to drive radio antenna of a transmitter.
4. Ultrasonic Amplifiers: Ultrasonic amplifiers are responsible for ultrasonic waves amplification.
5. Wideband Amplifiers: Wideband amplifiers are used to amplify a band of frequencies. They are used to amplify from DC to several tens of MHz.
6. Direct Coupled Amplifiers (DC Amplifiers): Direct coupled or DC amplifiers are used to further amplify the very low frequency signals.
7. Video Amplifiers: Video amplifiers are used to improve video signals in order to display it in high quality resolution.
8. Buffer Amplifiers: Buffer amplifiers are used for electrical impedance transformation from one circuit to another.
9. Operational Amplifiers: Operational amplifiers are used to perform mathematical operations on voltages.
10. Transistor Amplifiers: Transistor amplifiers are used to amplify the voltage or current of the input signal.
In the Full course, you will learn everything you need to know about Amplifiers with Diploma Certificate to showcase your knowledge/skill gained.
Amplifiers - Introduction
Amplifiers - Materials
Amplifiers - Transistors Overview
Amplifiers - Transistor Configurations
Amplifiers - Transistor Regions of Operation
Amplifiers - Transistor Load Line Analysis
Amplifiers - Operating Point
Amplifiers - Transistor as an Amplifier
Amplifiers - Transistor Biasing
Amplifiers - Methods of Transistor Biasing
Amplifiers - Bias Compensation
Amplifiers - Basic Amplifier
Amplifiers - Classification of Amplifiers
Amplifiers - Based on Configurations
Amplifiers - Multi-Stage Transistor Amplifier
Amplifiers - RC Coupling Amplifier
Amplifiers - Transformer Coupled Amplifier
Amplifiers - Direct Coupled Amplifier
Amplifiers - Power Amplifiers
Amplifiers - Classification of Power Amplifiers
Amplifiers - Class A Power Amplifiers
Amplifiers - Transformer Coupled Class A Power Amplifier
Amplifiers - Push-Pull Class A Power Amplifier
Amplifiers - Class B Power Amplifier
Amplifiers - Class AB and C Power Amplifiers
Amplifiers - Tuned Amplifiers
Amplifiers - Types of Tuned Amplifiers
Amplifiers - Feedback Amplifiers
Amplifiers - Negative Feedback Amplifiers
Amplifiers - Emitter Follower & Darlington Amplifier
Amplifiers - Noise in Amplifiers
Amplifiers - Exams and Certification
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