Audio frequency generator: Difference between revisions

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An audio frequency generator produces a continual audible monotone at a set frequency and level of volume. There are controls to adjust the frequency and the volume up and down as desired. Some also have a selector to switch the waveform type between sine wave, square wave and triangular sawtooth.
 
The task is to demonstrate how to emulate an audio frequency generator. It is permissible to use an inbuilt computer speaker if the system does not have the facility to utilize dedicated sound hardware.
 
The solution should include: