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Plasma Speaker.

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Plasma Speaker.

Unread postAuthor: warhead052 » Mon Oct 10, 2011 10:12 am

Here are 3 videos I saw on youtube, about plasma speakers (sort of).

[youtube]http://www.youtube.com/watch?v=SyL0aWEkO4E&feature=mfu_in_order&list=UL[/youtube]

This first one is pretty cool, but it only gets better...

[youtube]http://www.youtube.com/watch?v=G9bT50QZO1o&feature=mfu_in_order&list=UL[/youtube]

Hows that? And finally....

[youtube]http://www.youtube.com/watch?v=ISA4sXOyyQI&feature=mfu_in_order&list=UL[/youtube]

How cool is that? Can anyone explain how it works?
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Re: Plasma Speaker.

Unread postAuthor: jackssmirkingrevenge » Mon Oct 10, 2011 10:54 am

warhead052 wrote:Can anyone explain how it works?


http://en.wikipedia.org/wiki/Plasma_speaker

pity it only plays excrement.
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Unread postAuthor: danielrowell » Mon Oct 10, 2011 10:58 am

:shock: That's pretty darn cool!

[Edit]: Ninja'd by a few seconds.

Wikipedia wrote:Early plasma-speaker designs ionized ambient air containing the gases nitrogen and oxygen. In an intense electrical field these gases can produce reactive by-products, and in closed rooms these can reach a hazardous level.

I hope he's somehow using helium like the article says or he could be in trouble...
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Last edited by danielrowell on Mon Oct 10, 2011 1:01 pm, edited 1 time in total.
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Unread postAuthor: al-xg » Mon Oct 10, 2011 12:02 pm

I've seen and heard ones with much better fidelity, still only in the treble range but much clearer.

Wouldn't be my choice of music for testing speakers...
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Unread postAuthor: warhead052 » Mon Oct 10, 2011 12:13 pm

Its not a bad speaker, but it could probably use some higher voltage. If you listen to the end of the third video, you can hear the radio broadcast, which would explain the music.
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Unread postAuthor: Technician1002 » Mon Oct 10, 2011 7:31 pm

The one in the video has a bad problem with the jumpy flame. This is causing the location of the sound source to move with the flame. A proper one has a small stable flame that emits the sound.
The moving flame is causing Doppler shift as well as changing the direction the sound is projected resulting in amplitude shifts as the speaker "points" different directions at random times. I've seen much better attempts.
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Unread postAuthor: warhead052 » Mon Oct 10, 2011 8:39 pm

Well, its a first time around, and this is a college student (I think) that made it.
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Unread postAuthor: Zeus » Mon Oct 10, 2011 10:34 pm

What an electric arc makes is ozone (O<sub>3</sub>) and nitrogen dioxide (NO<sub>2</sub>).

If it isn't an overpowering smell, then you're fine. (You know when it's too strong, believe me.)

A couple of members here know how I intend to exploit that side effect of arcs.
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/sarcasm, /hyperbole
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Unread postAuthor: Technician1002 » Tue Oct 11, 2011 12:56 am

Zeus wrote:What an electric arc makes is ozone (O<sub>3</sub>) and nitrogen dioxide (NO<sub>2</sub>).

If it isn't an overpowering smell, then you're fine. (You know when it's too strong, believe me.)

A couple of members here know how I intend to exploit that side effect of arcs.


If the arc is in air, this is an issue. In a flame with a complex reaction, there is little ozone. The presense of fuel takes care of the Ozone. It is the ultimate Charcoal Filter. I'm not sure about Nitrogen Dioxide.
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Unread postAuthor: Zeus » Tue Oct 11, 2011 3:18 am

Ozone is produces more by silent discharges, I haven't studied the byproducts of electrical discharges to a great extent, but I do know that NO<sub>2</sub> is produced, an excellent though long topic is here at Sciencemadness.
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/sarcasm, /hyperbole
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