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  • Hifi
  • Hi-Fi
  • ForstæRker
  • Amplifier
  • Audio
  • Ab
  • Design
  • Mathematics


This project is concerning the design and construction of a Hi-Fi amplifier, consisting of an analogue solution based on specifications made from DIN/IEC standards and some estimations. The Hi-Fi amplifier is constructed with three modules, consisting of a volume control that has the ability to attenuate and amplify the signal, a tone control circuit to amplify/attenuate both bass and treble signals and a power amplifier, which is based on the LIN (three staged) topology with a differential amplifier, a voltage amplification stage and an output power stage. The output stage of the power amplifier is a class AB solution to compromise between efficiency and the output signal. The Hi-Fi amplifier is designed to be able to deliver a minimum of 10W output power in a 8Ohm load. The constructed Hi-Fi amplifier meets all the specifications for the volume control and the power amplifier, while the bass control circuit of the tone control deviates slightly from the requirements. The Hi-Fi amplifier is measured to deliver at least 10.1W at a rated input voltage of 0.5VRMS with a maximum total harmonic distortion of 0.162 %.

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