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16/02/2018

Compare Audio Amplifier and Tuned Amplifier

 Audio amplifiers
  • It amplifies wide band of frequencies. 
  • Resistive load is used in the collector circuit of the transistor
  • The resistive load does not depend upon the signal frequency.

Tuned amplifiers
  • It amplifies narrow or selective band of frequencies. 
  • Parallel tuned circuit is used in series with collector circuit of the transistor
  • The impedance of the parallel tuned circuit depends upon the signal frequency. 
  • The impedance of the parallel tuned circuit is very high at resonant frequency whereas its value goes on decreasing at off resonance frequencies. 
  • The tuned amplifiers are used to select specific frequency in the radio receiver.
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