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 system is developed based on prototyping boards which are also used for other labs.
Some specific lab material is required additionally to the base lab equipment.
Some improvements are suggested for the years to come.