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Old 25th February 2013, 03:53 AM   #241
Carlp is offline Carlp  United States
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The museum was claiming more than a million volts capacity with their BIG van de graaff generator, though I don't know what they were using for the sound as it was smaller, nor what kind of power. I'm well beyond my knowledge about such things, but I'm certainly curious about the low end...
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Old 25th February 2013, 11:19 PM   #242
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Quote:
Originally Posted by geraldfryjr View Post
No, I meant down to 300hz to 350hz and up to 20kHz of course.
The lowest frequency's are the hardest to produce as they require more displacement the lower you go.
To do this would require a lot of power!
I saw an example on 4hv.org that used a ceramic type transmitting tube.
From the video the flame was huge and was quite loud!
Very clean sounding when it wasn't clipping the audio.

I tried to search for it today but the site wouldn't let me sign in for some reason so it will take me some time to get that straightened out.
It was quite an impressive video.

jer
Hi Jer:
Thanks reply.
I think mid-range plasma of a narrow band operation will easy successful.
After testing ...... because ....
Pasma generate wavelength physic issue.
short wave length easy interrupted long wave length cause noise .

Aster
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Old 25th February 2013, 11:21 PM   #243
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Quote:
Originally Posted by Carlp View Post
The museum was claiming more than a million volts capacity with their BIG van de graaff generator, though I don't know what they were using for the sound as it was smaller, nor what kind of power. I'm well beyond my knowledge about such things, but I'm certainly curious about the low end...
a million volts
This make me panic.
Aster
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Old 25th February 2013, 11:40 PM   #244
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Yes, I often wondered if the flame got to a certain large size, that it might increase doppler distortions.

I also read the the noise issue diminishes as the flame frequency raises and is typically above 4.5Mhz is were it starts to be quiet.

FWIW

jer
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Old 26th February 2013, 12:48 AM   #245
Carlp is offline Carlp  United States
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Quote:
Originally Posted by asterkao View Post
a million volts
This make me panic.
Aster
Me too! Metal caging around the audience and lots of safety systems in place. I wouldn't have brought my wife and 2 kids into the room if not.

Carl
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Old 17th March 2013, 09:01 PM   #246
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A while back I had mentioned in another thread (that I can't seem to find now) of a 1kw plasma speaker that used a large transmitting tube (ceramic?) over at 4hv.org.

I just found it here,

Forums / High Voltage / Tl494 Big audio modulation Plasma Speaker / Tweeter 1kW - 4hv.org

Very impressive indeed!!!

Here is one more very cool setup,

http://www.youtube.com/watch?v=NeIAkKmUfn4

jer

Last edited by geraldfryjr; 17th March 2013 at 09:11 PM.
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Old 3rd September 2013, 02:24 AM   #247
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Click the image to open in full size.
Mid Plasma 555 and Plasma Tweeter working together

Last edited by asterkao; 3rd September 2013 at 02:39 AM.
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Old 3rd September 2013, 04:33 AM   #248
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Very Cool !!!!

jer

Last edited by geraldfryjr; 3rd September 2013 at 04:35 AM.
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