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Old 29th June 2006, 01:05 AM   #1
Nixie is offline Nixie  Canada
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Default Flame speakers

LOL
http://www.swtpc.com/mholley/Popular...lification.htm
Anyone DIY this?
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Old 29th June 2006, 05:58 AM   #2
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Nope, but I'm thinking of the world's coolest amp stack for concert duty.
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Old 29th June 2006, 08:35 AM   #3
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Yup! Radio-Electronics magazine in the early 80's had a project based on this
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Old 29th June 2006, 09:27 AM   #4
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I love the photo of the super-nerdy Three Scientists listening to music. They could be triplets but they all have different names.
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Old 29th June 2006, 12:47 PM   #5
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Quote:
Originally posted by bremen nacht
I love the photo of the super-nerdy Three Scientists listening to music. They could be triplets but they all have different names.

Haha.... it's making me think of Roswell /UFO's for some reason.
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Old 29th June 2006, 01:01 PM   #6
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I saw that magazine article and successfully duplicated the experiment in my high school electronics lab class back about 1971 or '72. I had trouble getting suitable material for the electrodes. If you want to try this today may I recommend getting thoriated tungsten tig welding electrode rods from your hood's welding shop. The wick seeding the flame with pottasium nitrate worked for me. It was so impressive that my electronics teacher arranged for the physics class to come have a demo.
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Old 29th June 2006, 01:10 PM   #7
bigwill is offline bigwill  United Kingdom
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How did it sound?
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Old 29th June 2006, 01:14 PM   #8
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Yes, I also remember reading about that some time back in the 70's. I have always wondered if the flame itself is silent enough? Usually you can hear a burning flame, but it depends on at what rate you are burning gas, of course. I suppose the cost of running those speakers would be prohibitive in the long run anyway.
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Old 29th June 2006, 01:17 PM   #9
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Quote:
Originally posted by bigwill
How did it sound?
It would only work intermittently because you had to establish a plasma between the electrodes. It would go for ten or fifteen seconds sometimes. That could be corrected by a proper design. Aside from the rush of the torch flamre the sound was absolutely sparkling clear. No bass of course.

You can get a similar effect by modulating a vacuum tube Tesla coil and listening to the brush discharge in air. I've set that experiment up on the bench many times over the years. It is a real crowd pleaser.
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Old 29th June 2006, 11:06 PM   #10
Nixie is offline Nixie  Canada
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Combustion is not a great idea to get plasma. Hill's solution in the Plasmatronic speakers was much better, and he also bothered to calculate things such as optimal plasma shape for flat frequency response, etc.
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