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prong
Experienced Roboteer
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Joined: 19 Jun 2004
Posts: 839
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hehe about the plasma ball breaking thing...
I once had a cheap one from Clints Crazy Bargains, $20 i think
anyway so i was swinging a fan cord around my room and hit it and it shattered. I cleaned up the glass and being the sort of person i am i turned it on. It did not do anyhting much so i pulled the high voltage circuit out to have a play with. Not that these things ran from a 12v plugpack, so i was not playing with 240v, though of course the high voltage circuit it has was still potentially dangerous.
Anyway so after receiving a fair few zaps from it as i played i found a few things out, '
- it would light up a fluro tube if connect to one end
- it would create a 1cm long spark to things
- It would burn holes in things, like your skin, it left little black burnt marks that you could see going into your skin.
- Lightbulbs make sucky replacment plasma globes.
Then a friend decided to see if he could take the zap by holding the contact when i switched it on. When I turned it on he did not get zapped at all, but as he let go he got a good shock. It turns out that when you grip the contact there is enough skin contact for the high voltage to flow across your skin and into the air from all over your body, and you do not get zapped. When you let go as the contact moves away it sparks to your skin, that burns through the high resistance outer layer and zaps the nice conductive inner bits.
Anyway so i found that if you held the contact tight and touched someone else it would zap them, but also you. If you held something metal the spark would travel from the metal and only zap them
then i found if you grabbed a fluro tube by an end it would light up. So i made a wide contact and taped it to my skin on my side, and had a play with the fluro tubes. A really long one would not light up when you grabbed it but if you held one end in one hand and ran the other hand from that end up long the tube it would start to glow all the way up. At night you could do some pretty cool lightsaber looking tricks with this, as if you ran the hand back down the tube it would go back out
anyway i was making a battery powered version but I found that the circuit uses the plug back and your power lines etc as one of the high voltage circuit contacts. So in normal use the high voltage would flow out through the plasma ball, through the air and back into anyhting grounded etc. This was all bad for batteries as they were the grounding, and it just tended to spark inside itself and not be very useful.
anyway it was lots of fun, i should dig it out again some time ![Smile](images/smiles/icon_smile.gif)
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Mon Nov 15, 2004 10:44 pm |
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