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811a coil

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Weston
Sun Jan 04 2009, 07:08AM Print
Weston Registered Member #1316 Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
 		This is my tesla coil that I made for the local science fair. Single tube and running off of 600v, so I only get 2 inch sparks.:-(( Any comments/tips to get bigger sparks appreciated. I am in the process of putting it in a case, so I dont have any pics of it running.
1231052795 1316 FT0 Im000297
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Arcstarter
Sun Jan 04 2009, 11:21PM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
 		Well, use a small MOT. Just find a microwave somewhere. Either that, or find a good high voltage capacitor and double your supply your using now.
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Weston
Mon Jan 05 2009, 04:04AM
Weston Registered Member #1316 Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
 		Ok. Can I use a MOC for the level shifter? On a related note the case is almost finished.
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Arcstarter
Mon Jan 05 2009, 05:21AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
 		Yes, a MOC will work, but you might want two in parallel. But MOTs are always better tongue .

Umm, give me your location, and if you are close enough i will donate a MOT. Just send your state by PM.
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Weston
Mon Jan 05 2009, 06:58AM
Weston Registered Member #1316 Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
 		No need. I already have a mot. Thanks for offering though. I can't use it for two reasons, tank capacitor is rated for 15kv not 20kv and my parents are safety obsessed(my dad wanted to enclose the entire coil in Plexiglas). I am almost finished, 2nd light should be tomorrow. Here is me with the coil. It is fairly big but I am mostly just short frown .
1231138682 1316 FT61181 Im000302
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Firefox
Mon Jan 05 2009, 09:17AM
Firefox Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
 		Nice looking coil, Weston. I love the wood/plexy base.

I understand about your parents, Weston. My dad said after I had a few years at college maybe he would help me install a 40A wall socket. The worst part was his laughing at me like it was a stupid idea. Its not like going to college is going to make me any better at don't tough the high voltage output/wall socket. Good luck with your parents and you future in HV! Perhaps you can get your dad or mom into the hobby, or at least show him some sparks to enlightning him.
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Mads Barnkob
Mon Jan 05 2009, 03:56PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		You should have no trouble at all using a MOT with a 15kV rated tank capacitor.

I am using a 1nF 20kV pulse rated mica in my dual 811A vttc and its fed by a MOT with voltage doubler, 200Vac in from a variac, so its somewhere around 4kV positive AC peaks. 12" inch sparks.
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Weston
Mon Jan 05 2009, 04:53PM
Weston Registered Member #1316 Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
 		Ok. I shall try after science fair. (need a fully working coil for demonstration)
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Arcstarter
Mon Jan 05 2009, 07:15PM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Weston wrote ...

Ok. I shall try after science fair. (need a fully working coil for demonstration)
Yes indeed :P. The MOT will make the tube run red until good tuning is achieved. If your tank cap dies, send me a PM :P.
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Weston
Mon Jan 05 2009, 07:20PM
Weston Registered Member #1316 Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
 		wiring is now finished. Whew, it took me 2 hours. first light should be when my dad gets home frown
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