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harmonic wave analysis

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fran1942

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Hello, I am analysing waveforms and their harmonics.
I did a lab experiment and need to comment on the "relationship of duty cycle and amplitude of the fundamental frequency".
I am struggling with this somewhat. Can someone please help me with that relationship ?

Thanks kindly for any help.
 

I expect the amplitude of the fundamental is greatest when the duty cycle is 50%. When the duty cycle is very low or very high, the amplitude of the fundamental is very small.
 

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