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The Audio amplifier project is a one day sneak preview of the electronics taught at the Industrial Systems section of HES-SO//Valais Wallis. As such, it presents a mixed analog/digital system.

The system consists of:

  • an A/D converter which receives an audio signal
  • a digital circuit (FPGA) which mutiplies this signal by a gain and builds a Pulse Width Modulated (PWM) signal out of it
  • a class D amplifier which drives a loudspeaker from the PWM signal
  • a step-up circuit which generates a power supply voltage from a 12 V battery in order to have enough power to drive the loudspeaker

The project is presented to the EMVs students. They are provided with specifications in french.

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