Flame speakers

Nixie · 29th June 2006, 01:05 AM

LOL
http://www.swtpc.com/mholley/Popular...lification.htm
Anyone DIY this?

classd4sure · 29th June 2006, 05:58 AM

Nope, but I'm thinking of the world's coolest amp stack for concert duty.

Geek · 29th June 2006, 08:35 AM

Yup! Radio-Electronics magazine in the early 80's had a project based on this

bremen nacht · 29th June 2006, 09:27 AM

I love the photo of the super-nerdy Three Scientists listening to music. They could be triplets but they all have different names.

classd4sure · 29th June 2006, 12:47 PM

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.

rcavictim · 29th June 2006, 01:01 PM

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.

bigwill · 29th June 2006, 01:10 PM

How did it sound?

Christer · 29th June 2006, 01:14 PM

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.

rcavictim · 29th June 2006, 01:17 PM

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.

Nixie · 29th June 2006, 11:06 PM

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.

29th June 2006, 01:05 AM	#1
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	Flame speakers LOL http://www.swtpc.com/mholley/Popular...lification.htm Anyone DIY this?

29th June 2006, 09:27 AM	#4
bremen nacht diyAudio Member Join Date: Feb 2004 Location: england	I love the photo of the super-nerdy Three Scientists listening to music. They could be triplets but they all have different names. __________________ All this radio needs is a fuse

29th June 2006, 01:01 PM	#6
rcavictim diyAudio Member Join Date: Jun 2004 Location: Cool end of a soldering iron NW of Toronto	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. __________________ I.Q.Test. Have you ever purchased a recreational snowmobile?

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29th June 2006, 05:58 AM	#2
classd4sure Account Disabled Join Date: Feb 2004	Nope, but I'm thinking of the world's coolest amp stack for concert duty.

29th June 2006, 08:35 AM	#3
Geek diyAudio Member Join Date: Sep 2004	Yup! Radio-Electronics magazine in the early 80's had a project based on this

29th June 2006, 01:10 PM	#7
bigwill General Nuisance diyAudio Member Join Date: Dec 2004 Location: UK	How did it sound?

29th June 2006, 01:14 PM	#8
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	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.

29th June 2006, 11:06 PM	#10
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	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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