There are many applications of transistor in the electronics and communication field.Manly it is used in amplification purpose in the circuits.They are classified according to their uses ,frequency capabilities, coupling devices and mode of operations which are as following:
- According to use; transistor amplifier are classified as voltage amplifiers and power amplifiers.At first it is use to increases the voltage level or strength of the signal while the after it increase the power level or strength of the signal in the circuit.
- According to the frequency capabilities; these are classified as audio amplifiers ,RF amplifiers etc which are use to amplify the lying in the audio range (i.e 20Hz -20kHz) and radio frequency range etc respectively in the circuit.
- According to coupling devices; if there is a single stage amplifier, it is unable to amplify the signal to fulfill the practical requirements.So other additional amplifier i s necessary to amplify the signal.But to preform this of the one stage is required to coupling to the other next stage.So depending upon the coupling devices used in the circuit,the transistor amplifier are classified as direct-couple amplifier,R-C couple amplifiers, transformer couple amplifiers etc.
- According to the mode of operation; the transistor amplifiers are classified as class-A amplifiers,class-B amplifiers, class-C amplifiers .This classification in depends upon the portions of the input waveform which reached into output stage. For more
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