http://pufone.org This is a solid-state Tesla coil.
The primary runs at its resonant frequency in the 41 KHz range, and is modulated from the control unit in order to generate the tones you hear.
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Explaination... It does this by flashing (really,really FAST) and affecting the air around it... this causes the air to vibrate, and transform itself into sound waves that are audible to the human ear.
I was gonna ask what this sounded like 'in the flesh'. And what's this talk about needing amplification??? the air around the arc is explosively ionised causing an immense pressure wave - Lightning is loud enough :-)
You wouldn't need an amp for this. Amps are usually to make things louder, this would have been loud enough without anything to make it even louder. I imagine many people would have been covering their ears. Telsa coils can be quite loud.
You need 10,000 volts just to get a small 1 inch or so arc of electricity in the air. This is much more than that. While it would be decently easy to get the bolt to jump to the input of an amp, it still wouldn't do anything though. The electric bolt is only going to supply the amp with input... the output would arc from the amp to a ground, which would fry the thing.
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well done!
It does this by flashing (really,really FAST) and affecting the air around it... this causes the air to vibrate, and transform itself into sound waves that are audible to the human ear.
I imagine many people would have been covering their ears. Telsa coils can be quite loud.