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killa_454

Fri Nov 17 2006, 10:09AM

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Registered Member #302 Joined: Fri Mar 10 2006, 05:22AM
Location: vancouver
Posts: 9

im planning 2 use an old comp monitor 2 make a vdg sort of. im going 2 strip the crt monitor down 2 just the curcuit board and flyback. get a piece of pvc a couple of stainles steel bowls make a basic vdg withought guts(motor belt ect.)
and hook up the flybacks hv out 2 the inside of the sphere. im prety sure this will work considering the monitors flyback is rectified. but i dont know if this whould be safe 2 touch so im not going 2 im going 2 build a strike rail around it 2 showcase the arcs. sorry for the bad gramar im lazy.

Sulaiman

Fri Nov 17 2006, 12:11PM

Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140

Sounds ok.
A few things that come to mind;
1) Since the power is from the main supply you should definately not allow people to feel the arc
as there is a posibility of electrocution from the mains.
If you make a 555/494 oscillator and use a suitable transistor you could go battery powered
which would be much safer to 'play' with.
2) a spark will jump about 3mm per kV with large electrodes, more with 'pointy' electrodes
3) corona will form around objects when there is more than 3kV per mm of radius
e.g. 30kV dc requires 10mm diameter surfaces
4) sparks can track across surfaces at around 300V/mm
e.g. 30 kV needs about 100mm (4 inches) for safe long term insulation

Since you didn't ask any questions I assume this is an ongoing project
so it would be better in the PROJECTS forum (not HIGH VOLTAGE)

Michael W.

Fri Nov 17 2006, 03:27PM

Registered Member #50 Joined: Thu Feb 09 2006, 04:07AM
Location: Vernon, B.C, Canada
Posts: 324

I'm guessing VDG is a Van De Graff Generator,

Its more of an electrostatic gnerator, yours Idea is more of a transformer with a large terminal...I wouldn't touch it

Steve Conner

Fri Nov 17 2006, 04:24PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Laziness is no excuse for bad grammar. And you can't call that thing a VDG, since it doesn't have a belt. I don't know what you'd call it.

Andrea87

Fri Nov 17 2006, 10:26PM

Registered Member #494 Joined: Thu Nov 09 2006, 02:42AM
Location: Udine, Italy
Posts: 31

I suggest you to make a real vdg, using the flyback as "corona supply" to charge the elastic tape going to the sphere. it will give you very good results. Running the flyback at its best just to charge the sphere may be hazardous for its life, these transformers haven't been designed for open to air application at highest powers (and voltages), wich may cause the breakdown of the internal insulation (it occurred to me once, so I remember well the hum and the smoke coming out from the little transformer).

so... go for a real VDG powered by a serious DC flyback!

killa_454

Tue Nov 21 2006, 01:57AM

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Registered Member #302 Joined: Fri Mar 10 2006, 05:22AM
Location: vancouver
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lazyness is an excuse. notice i said "vdg sort of" because i didint know what 2 call it u dont even know

i used vdg so people whoild know basicaly wat im trin 2 build

Michael W.

Tue Nov 21 2006, 04:47AM

Registered Member #50 Joined: Thu Feb 09 2006, 04:07AM
Location: Vernon, B.C, Canada
Posts: 324

Here we go, its a flyback transformer with a bowl attached to it ....I would recommend not touching it. If your looking for something physically interactive build a real VDG. Here, you can build one with a pop can....

I've built one along time ago and it can work quite well.

Steve Conner

Tue Nov 21 2006, 12:04PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

This thread is in danger of getting locked unless killa_454 stops annoying me. There's a board rule against crappy spelling and grammar, so it's not just a personal grudge.

To stay on topic, I found this schematic for a "flyback VDG" over on Information Unlimited, which is where this thread really belongs.

Mosfet Strawberry Circuit

Wayne Tang

Tue Nov 21 2006, 05:32PM

Registered Member #491 Joined: Thu Nov 09 2006, 02:03AM
Location: S. California
Posts: 5

Steve -

You bring up a good point. Also, there is no room for lazyness when it comes to high voltage. Not caring about the details with even the simplest high voltage circuits burns up equipment and seriously puts the experimenter's safety at risk. The last small "flyback" driver I built could easily burn flesh - it put out 6 ma of current. I was careless once and lit a part of my wooden desk on fire (after all, it was powered by "only" a 12 volt gel cell.) I now pay much greater attention to what I am doing when I work with any electronics.

killa_454

Wed Nov 22 2006, 05:06AM

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Registered Member #302 Joined: Fri Mar 10 2006, 05:22AM
Location: vancouver
Posts: 9

im not lazy when it comes 2 saftey im just lazy with shit that doesent mater
thanks for the replys.

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