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geoff wrote:
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And that 34kHz ring is the same freq if excited by the leading edge of a
2kHz square wave, or by a 1kHz or a 5kHz square wave ?

** The ringing is consistent.

The harmonics of
those square wave frequencies being another thing and unrelated ...

**The frequency *spectrum* of the ringing square wave was the question.

Is the ringing frequency evident IN it or not ?

( BTW a decaying sine wave is not one frequency )

Is a *new* frequency being create merely by a resonance ?

Are the laws of physics being broken ?


....... Phil