Amplifier with its Types

October 22, 2007

Amplifier is nothing but a device that uses little quantity of power to control a large quantity of power. It is referred to an electronic amplifier, often used in audio applications. The transfer function of the amplifier is the input to the output of an amplifier and the magnitude of the transfer function is termed as gain. We can find three types of amplifier devices and each has its strength and weaknesses.

A perfect amplifier will perform its task within certain set limits which will not add or subtract anything from the original signal.

Currently available amplifier devices are Vacuum Tube (Valve), Bipolar Junction Transistor (BJT) and Field Effect Transistor (FET). Derivatives of these amplifiers are IGBT Insulated Gate Bipolar Transistor and MOSFET Metal Oxide Semiconductor Field Effect Transistor which is a popular choice among many designers as it has desirable characteristics. It is most often used over any other transistor which is efficient and runs cooler.

An amplifier is supported by passive components that are resistors, capacitors and inductors, without these an amplifier can’t be build. These devices have various current outputs. It allows you to create a voltage amplifier. Valves and FETs are voltage controlled devices and Bipolar Transistors are current controlled. This means no current is drawn from the signal source. You can convert the current output of these amplifying devices into a voltage only using support components.

Now that you know the types of amplifiers you may love to know the purpose and its installation. The signal that comes from a radio, tape, CD player or some other source is very low at first in the milli-volt range. Then these devices are installed with pre amplifier which increases the signal voltage from the milli-volts range up to 1-4 volts or so. In some system these signals are from 5 Hz to 40 KHz, and most other has 20 Hz to 20 KHz. This signal is connected to RCA cables to the inputs of the amplifier.

So here is one good way to improve the audio effects of your music system. Use an amplifier and enjoy music to its fullness.

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