Umudike Journal of Engineering and Technology

Michael Okpara University of Agriculture, Umudike


Udo, E. U.
Department of Electrical/Electronics Engineering, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria


This paper focuses on the reduction of crossover distortion in class-B amplifier. In this paper, a negative feedback was applied to control the output signal by taking a fraction of the amplifier output back to the input. The high slew rate operational amplifier helped in inter-stage amplification and frequency response application. The capacitor biased coupled diode connects the electrolytic capacitor in parallel with diode to form boost trap. Again, one of the transistors amplifies the positive half cycles of the input signal and the second transistor amplifies the negative half cycle of the input signal. These transistors supplied the amplified version of the input signal to the load. At the output stage, the audio input was converted into sound energy by the output transducer.  The results obtained in class B amplifier showed an audio music with a laudable sound through the loud speaker, a peak current of 2.4A, a d.c. current of 1.53A, a d. c. power of 36.72W, an output power of 28.8W and efficiency of 78.47%.

Keywords: Class-B amplifier, crossover distortion, negative feedback, operational amplifier

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Friday, December 18, 2015

Vol. 1 No. 2, DEC 2015

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