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Don Pearce wrote:
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** You sure about "any" ?

Square waves have cascading, odd numbered harmonics.
The ringing one would merely be out of step with the others.

Nothing to do with the frequency of the wave or its harmonics. Each
ringing event is separate and is triggered by the broadband energy of
the rising or falling edge.

** Gobbledegook.

The frequency of the ring is determined by
the LC circuit that is being struck by that edge.

** So a linear circuit with a resonance creates a new frequency ?

Does not do so with a sine sweep.



...... Phil