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Old 11th January 2002, 12:37 AM   #1
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Default Pass plasma speaker history?

NP,

As I recall, you had a design out for an electrostatic type speaker with using ionized gas (from RF) as a membrane. There is also a rumour I have heard that you got sick from ozone poisoning as a result. I believe there were also companion amps (which are probably less interesting than the speakers and plasma generatiors themselves).

I am really interested in a short story on this project. I have tried Plasmatronic Hill Type 1's and am still kicking myself for not buying the pair. Plasma rules!

Do your bit for the ozone layer, get ionic (but remember to put on sun-lotion and eye protection to shield from excess ultraviolet rays).

Petter
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Old 11th January 2002, 01:03 AM   #2
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also better make sure your listening room is well ventilated, excessive ozone exposure can be harmful
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Old 11th January 2002, 03:09 AM   #3
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Default Design idea: Cell phones to set up plasma?

I can go to any scrapyard and pick up a shitload of 12 month old GMS cell phones. What if I stacked them all close together and doctored them to keep hammering on the base stations?



It probably won't work, but they are strong enough to get my head hot and mess with airplane navigation.

Petter
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Old 11th January 2002, 07:29 PM   #4
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The "ion cloud loudspeaker" used photocopy
machine ionizing nichrome wire strung in a flat
array a bit like a window screen, but with more
space between the wires, and charged to a variable
DC potential of about 10 KV.

This screen developed a layer of ionized air, and was
enclosed between two stators, much like an electrostatic
speaker, except that instead of a charged plastic diaphragm,
you had a charged semi-flat layer of gas, and you could
push-pull it with high AC voltages on the stators.

It worked fairly well, and gave new meaning to the word
"transparency".

It also had several flaws, one of which did result in a
trip to the local emergency room with breathing problems
similar to those sometimes experienced by arc welders and
caused by extended exposure to ozone.

The Wall Street Journal printed my comment:

"It was the perfect high end audio product: Exotic, inefficient,
expensive, unavailable, and toxic."
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Old 11th January 2002, 08:17 PM   #5
Bill F. is offline Bill F.  United States
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Woo hoo! Plasma! Hot (electrically conductive) dickety dawg!

A trip to the hospital, huh? That's one way to know your having fun.

I've been wondering about the possibility of a laser-pumped corona discharge line source. (Laser doesn't make RFI.) Shine a laser down a knife edge, or maybe a fine-tooth saw edge. More "transducer area" than a point-source spike discharge. More bass? Yeah, I know, more ozone, too... Could gas-shield it, but I never liked the idea of big noble gas cylinders in my living room.

I also thought of loading a corona discharge with a downward-facing horn throat. Squirt a little helium up there, the corona heats it up, and its low density should keep it up in place. Helium flow could be very minimal.
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Old 12th January 2002, 02:43 AM   #6
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Default Re: Pass plasma speaker history?

Quote:
Originally posted by Petter
NP,
As I recall, you had a design out for an electrostatic type speaker with using ionized gas (from RF) as a membrane. There is also a rumour I have heard that you got sick from ozone poisoning as a result. I believe there were also companion amps (which are probably less interesting than the speakers and plasma generatiors themselves).
Do a search for "plasma tweeters"... basically, you use a small tesla coil to create HV and ionize air near a wire to create a "flame"; the high voltage then gets modulated to an audio signal to create the sound. As i recall, this works only well for a tweeter and the sound is suposed to be quite good. As you said, ozone is a concern (it's poisonous in high concentrations) so you might want to play that on an open room I have some schematics laying arround if you can't find it on a search engine.
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Old 3rd April 2002, 08:14 PM   #7
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Hi,

I build a pair of plasma tweeters, and there is no smell even after hours, likely because it is hot inside the housing.

Ozon falls to pieces fast, when it is hot.

This is not my explanation, just read it somewhere else.


Click the image to open in full size.

Bernhard
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Old 3rd April 2002, 08:24 PM   #8
Bill F. is offline Bill F.  United States
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Wow, those units are pretty.

Are they a kit? What's the manufacturer?

Any performance curves, specs, etc.?

Bill
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Old 3rd April 2002, 08:59 PM   #9
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There is no kit, no manufacturer.

Various schematics can be found in the internet just by typing +plasma+tweeter

The horn is taken from the Visaton TL16H horn tweeters.

I use it with a 5 kHz 24 dB crossover, soon it will be changed to 3,5 kHz.

It sounds very real...

I have curves somewhere, but I am not shure if they are correct, my notebooks soundcard isnīt so good.
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Old 3rd April 2002, 09:08 PM   #10
Bill F. is offline Bill F.  United States
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Your chassis and horns look so nice, I thought it must at least be a kit.

Nice work!

I've been through the DIY plasma tweeter sites, but none of the pics looked as clean as yours.

Is there any danger of arcing to your metal horn throats?

What's your approximate efficiency with the horns? From what I've read, the other DIY plasma tweeters are plagued with inefficiency.

Bill
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