The Transistor as an amplifier is one function of the amount of the transistor, apart from functions use the transistor as a switch too of course. The current existence of a transistor in an electronic device is a must, for example, Tone Control, Amplifier (Amplifier end), the pre-amp and a series of others.
Signal input Transistor can make a great on the output current can be corroborated, could brupa DC and AC current prinsispnya to use in a transistor amplifier is as "a small current in the base used to control a larger current is given to the collector of the transistor is passing."
This means that when the base current is changed then the reinforcement of the case and the larger currents will flow from collector to emitter, this condition can be described as reinforcement using transistors.
Not only can strengthen signals, can also be used as a transistor amplifier current, voltage amplifier or amplifier power. The following is an illustration of the transistor amplifier circuit as used in the amplifier is simple:
Still remember the principle on the transistor as a switch? , where the condition of the transistor in saturation/arus base that flowed quite large so that the collector and the emitter relate gratitude as a cable connected, whereas at the moment conditions are cut off, the collector and the emitter could relate gratitude as a switch between the collector and the emitter has a very big obstacle, now in use as a transistor amplifier "not" be on the conditions of the two. Or it could be said that the base of the transistor is in the condition between the cut-off and saturation.
In addition to the transistor is able to work with optimum working point of the amplifier with transistor must also be determined, there are several types of amplifier, which is determined by the load line AC/DC:
Amplifier class A amplifier, at this point it works around type landscaped load line.
Class B amplifier has a point of work in areas cut off.
Amplifier class C under the areas cut off.
Amplifier class AB amplifier is a type which is a combination of class A and class B that work interchangeably with NPN and PNP transistor type.
For this type of amplifier types I will explain in more detail at a later time 
, but the earlier we must understand in advance with work I described transistor as an amplifier of, may be useful
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