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Plasma discharge vs arc discharge vs flame
Plasma discharge vs arc discharge vs flame
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Old 20th February 2018, 11:11 PM   #1
hellokitty123 is offline hellokitty123  United States
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Default Plasma discharge vs arc discharge vs flame

Does anyone have any knowledge on the pros and cons of plasma discharge (high voltage, low current) Arc discharge (High current. low voltage) and flame (oscillating flame) methods of audio reproduction and how to produce them? Looks to be a very obscure subject with little to no information on the web.
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Old 20th February 2018, 11:20 PM   #2
Andrew Eckhardt is offline Andrew Eckhardt  United States
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The primary problem is the ozone.
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Old 20th February 2018, 11:36 PM   #3
hellokitty123 is offline hellokitty123  United States
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Ozone is solved with active carbon. Nitrous oxide is a more troublesome component that the plasma discharge method produces.

I'm less concerned about toxic gases for now and more concerned about the methodology.

The plasma discharge method is what people usually refer to when they talk about plasma stuff in audio.
I'm particularly interested in the other two options, arc discharge and flame methods.
I've seen a few things written about flame but not much.

Arc discharge, also known as carbon discharge is a low voltage option so it shouldn't produce ozone but it might still produce nitrous oxide.
I cannot find any written material on this method other than the fact that it exists but I am extremely interested in it because it trades high voltage for high current. I'm trying to think how you are supposed to create a plasma arc without voltage.
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Old 20th February 2018, 11:40 PM   #4
Andrew Eckhardt is offline Andrew Eckhardt  United States
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Low voltage arc sounds fairly nonlinear to me. Try it. Nitrous is a lot of fun compared to ozone.
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Old 21st February 2018, 12:05 AM   #5
hellokitty123 is offline hellokitty123  United States
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How do you make a low voltage arc?
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Old 21st February 2018, 12:18 AM   #6
Bigun is offline Bigun  Canada
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Plasma discharge vs arc discharge vs flame
There are many ways to create a plasma discharge - you simply have to ionize the gas in question. You can use your basic avalanche breakdown - high voltage. You can use rf energy, something around the ubiquitous 13.56MHz works well. It helps to avoid creating reactive species that corrode the surroundings. Helium is pretty benign and not so hard to ionize.

Look up some of the work by Dr. Braithwaite in the UK Open University. One of his students recently published a thesis (Yvonne Sutton).

There's load out there is you search for it.

I remember a few decades ago one of the big Japanese welding companies was looking for ways to reduce the high noise levels from welding equipment and ended up showing off a computer driven welding torch playing symphony !!
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Last edited by Bigun; 21st February 2018 at 12:21 AM.
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Old 21st February 2018, 12:45 AM   #7
globalplayer is offline globalplayer  Germany
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Quote:
Originally Posted by hellokitty123 View Post
How do you make a low voltage arc?
High current.
Like in welding.
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Old 21st February 2018, 01:08 AM   #8
Pano is offline Pano  United States
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Plasma discharge vs arc discharge vs flame
Yep, I've run many a carbon arc spotlight and projector. Normally 24V, like welding. You touch the rods to start the arc, then pull them apart. Xenon lamps are similar, but use a strike circuit to start the arc, since the electrodes don't move.

I've done a little reading on the talking flame stuff and IIRC it had to be modulated on an RF carrier. Could be wrong, someone here will know.
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Old 21st February 2018, 02:23 AM   #9
hellokitty123 is offline hellokitty123  United States
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Always thought it needed voltage to jump the gap. Good to know you don't require a 15kv supply to attempt this stuff.

Plasmas are effected by magnetic fields.
What about running a continuous arc and modulating it with an electromagnet? Never seen this done.

Last edited by hellokitty123; 21st February 2018 at 02:44 AM.
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Old 21st February 2018, 12:22 PM   #10
AVWERK is offline AVWERK  United States
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Try Hill Plasmatronics 1 loudspeaker

Regards
David
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