Quote from: ramset on May 09, 2015, 09:39:31 AM
   

Nope, I hate to be a party pooper, but don't even go there.

Quote from: tinman on May 09, 2015, 09:14:13 AM
So much to learn,so little time.
But today i learned that sound waves can create a harmonic within an inductor that results in a voltage being created across that inductor. In this case i was using a piezo to create sound waves at a frequency of around 130Khz(although there were some lower value frequencies) directed at a ferrit Ecore transformer. At the right frequency,i could get around 4VPP across the transformer-->not to bad for sound waves. 

Dear Tinman.

I also have that "T" shirt !!   

https://www.youtube.com/watch?v=Ql2zfs5vevM

Enjoy.

Cheers Grum.

QuoteAt the right frequency,i could get around 4VPP across the transformer-->not to bad for sound waves.

But you didn't measure the output impedance of the voltage source.  Without knowing the output impedance you have very little information.

Quote from: Grumage on May 09, 2015, 10:06:57 AM
I also have that "T" shirt !!   

In such experiments I was always missing the visualization of the longitudinal standing waves in these ferries.

Visualization of transverse vibrations on a surface is easily done with fine sand as in the cymatic Chladni patterns but visualizing the longitudinal vibrations is not so easy ...especially in a rod.

Would this be considered an eddy current on a macro scale.