"Can I use an Arduino as an audio amplifier?"

 

Of course, this is not a normal function of a microcontroller, but as there is no limit to creativity there is a possibility. We can think of a digital amplifier, applying the audio signals to an Arduino input and using them for pulse modulator, thus creating a PWM signal generated by the microcontroller. This two-phase signal can be taken to a power stage where it powers a speaker.

 

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