Jeff07971 wrote: > The flat top of a square wave is in effect a "DC" it cannot be flat if > you cannot pass "DC" > > The rising edge is effectively a very high freq nearly ∞ in > contrast to the fundemental > > 2169721698 > > > https://en.wikipedia.org/wiki/Square_wave I'm not sure what you are showing with the diagrams but a 100Hz square wave for example can be reconstructed from a sine wave of 100Hz plus all the odd harmonics. No DC required.
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