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Old 6th September 2004, 07:37 AM   #21
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Woot.

I'd recommend a pentode... nice constant-current characteristic... add some degenerative (cathode) feedback of some sort to linearize the distortions.

Tim
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Old 6th September 2004, 12:38 PM   #22
SY is offline SY  United States
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Last week, I visited a company that specializes in creating free-air and air/argon plasmas in large volume spaces (like one or two cubic meters). The 125kV transformers were very impressive. I immediately started thinking about how to modulate them via their primaries...

Plasma woofers, the next step.
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Old 6th September 2004, 08:05 PM   #23
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You need a sheet of plasma thinner than the smallest wavelength to be reproduced. I don't think you can manage that with such a setup. An array of discharges may be a better idea.
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Old 11th November 2004, 03:11 AM   #24
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Power supply is done, and here are the output devices.

Click the image to open in full size.

Since I'm using one output tube per channel, some current sharing resistors will have to be used to split the power evenly between all plasma cathodes.
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Old 11th November 2004, 06:10 AM   #25
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I remember an article in either Electronics Now/Radio Electronics/Popular Electronics (whichever name it had that week..)
About building a plasma tweeter.
I forget the circuit details,but they used a small alcohol lamp...

I might have that issue around somewhere...I'll have to look..
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Old 25th November 2004, 01:34 PM   #26
Prune is offline Prune  Canada
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Legal question: Do I need to ask permission for using a patented design even if I build it for my own experimentation and do not use it to make money? I'm wondering if I need to contact Dr Hill to ask if I can use his design from the plasma patent. I'm just worried that he might say no, in which case I'll be in a worse position than if I hadn't asked.
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Old 25th November 2004, 01:42 PM   #27
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Quote:
Originally posted by Prune
Legal question: Do I need to ask permission for using a patented design even if I build it for my own experimentation and do not use it to make money? I'm wondering if I need to contact Dr Hill to ask if I can use his design from the plasma patent. I'm just worried that he might say no, in which case I'll be in a worse position than if I hadn't asked.
If it is for private non-comercial use you are ok.
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Old 25th November 2004, 01:43 PM   #28
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Hi,

Quote:
Legal question: Do I need to ask permission for using a patented design even if I build it for my own experimentation and do not use it to make money?
I don't think so...

Cheers,
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Old 25th November 2004, 05:11 PM   #29
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Coupla points:

DC discharges of the HV type that are also at high currents are DANGEROUS. You can get dead quickly with HV at relatively modest currents. Like <100ma.

NATURAL GAS!! SPECTACULARLY BAD IDEA!!

People get really burnt and dead when that natural gas goes BOOM! Bad idea.

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Old 25th November 2004, 10:55 PM   #30
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Heh.

Propane is fun, you could leave an unlit torch blowing in the basement all night amidst flaming water heaters and heating furnaces and still get nothing. Why? Because, it's the correct mixture *coming out the torch*. It just dissipates further in the air.

Not that I would recommend anyone actually try that... I don't know how strong the diffusion is (propane is much heavier so will settle, unlike methane which will float harmlessly out, unless there is an utter mess of it).

Tim
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