It always a good idea to connect output to a speaker to get the feeling that what actually the device do in reality.
Usually we connect the output to CRO in our college labs, But I feel its always a good idea to take the output to a speaker in your own experiments labs.
The Sine waves you see in the CRO gives you experimental results,but if you need to feel electronics it always good to connect the outputs to some display or speaker kind of devices.
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