" writes:


Now a clever guy name Fourier proved that you can mathematically
create a waveform from a series of sinewaves....but for square
waves, some of those are HIGH voltage sine waves.


The harmonics are of lesser amplitude than the fundamental frequency.

http://mathworld.wolfram.com/Fourier...quareWave.html

That's not my memory, but it's been 25 years since I did that
homework, so I could easily be wrong.

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