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4hv.org :: Forums :: Tesla Coils
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Commissioned Gas Discharge Glow Tubes for SSTCs

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zrg
Mon Nov 12 2012, 10:23AM
zrg Registered Member #4762 Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
Can you make a photo of the ball's bottom? I'm really interested to see the way you connected the inner ball's tube to the 10L flask neck.
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RateReducer
Mon Nov 12 2012, 08:52PM
RateReducer Registered Member #4603 Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
new Globe:

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Shrad
Mon Nov 12 2012, 09:33PM
Shrad Registered Member #3215 Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
I'm sure plenty of gases or organic compounds would react strangely, like perfumes, cosmetics, even medicines, which contain much complex volatile compounds...
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Polonium210
Tue Nov 13 2012, 12:18AM
Polonium210 Registered Member #3450 Joined: Sun Nov 28 2010, 05:01AM
Location:
Posts: 61
zrg wrote ...

I found an interesting mix a few days ago: krypton and... vacuum grease that I use to tighten the connections!
Two big balls made with that mix are really awesome.
I wish I'd had a fellow chemist who would be able to predict the effects of adding different organics, metal vapours and other impurities to the gases...


I would like to purchase a globe like this. Message me with details please :)
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cbfull
Wed Nov 28 2012, 09:54PM
cbfull Registered Member #187 Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
Are you guys baking the glass first to get the moisture out?
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GrantX
Wed Nov 28 2012, 11:37PM
GrantX Registered Member #4074 Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
zrg wrote ...

UPD. All these balls and tubes can be powered with a flyback. The aluminium foil or any similar conductive material makes them a cauldron type stand-alone plasma ball, when HV is applied to it. Tried powering my balls in such a way - watch the video (better in HD).

Wow, that works very well. I assume that's an AC flyback? What driver circuit did you use? I've been thinking of making a plasma globe driver for a while, but I haven't put a lot of research or effort in yet.

Also, I think I'll be able to buy one of your custom globes around Christmas time. Looking forward to it! :D
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zrg
Thu Nov 29 2012, 03:36PM
zrg Registered Member #4762 Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
XravenorX wrote ...

I assume that's an AC flyback? What driver circuit did you use?

Yeah, an AC one. The driver there was IRS27951, it doesn't work well on a flyback transfromers actually. I should move to something like TPS92020. The higher is frequency, the better the balls should work. I also want to make experiments with an interrupter and/or burst mode.

cbfull wrote ...

Are you guys baking the glass first to get the moisture out?

That isn't actually required here, as the pressures where inert gases form a thread-like discharge are much higher than for classic neon sign ones (10-200 Torr vs 1-4 Torr). But, of course, baking under vacuum won't ever do any harm to the beauty of the discharge, more like the opposite :)

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