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Forums
4hv.org :: Forums :: Tesla Coils
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Need some advice...

1 2 
Move Thread LAN_403
=P
Sat Mar 13 2010, 05:22AM Print
=P Registered Member #2736 Joined: Sat Mar 13 2010, 03:48AM
Location:
Posts: 5
 		Hey all, new to the site. new to telsa coils. a classmate had decided to make a tesla coil for our project and we just went at it. we went a little big.... the spark is only about 6". we will cut off the extra wood...
Neon transformer. 9kv @ 30mA
Tank Cap 9.0nf
Primary 1/2" at 1/2" spacing.
Secondary. is either 26 or 28awg. but about 900 turns on 4" pipe.
toroid 7" pie pan surrounded by 4" aluminum ducting.
the white wire is 6awg and the red is 4awg.
the main spark gap is out of tungsten.
Here is the video of the tesla coil at work. Any help is appreciated.
http://www.youtube.com/watch?v=_0DMaFwEWzM


1268456417 2736 FT0 Img 0136

1268456417 2736 FT0 Img 0137

1268456417 2736 FT0 Img 0138

1268456417 2736 FT0 Img 0140

1268456417 2736 FT0 Img 0141

1268456417 2736 FT0 Img 0142

1268456417 2736 FT0 Img 0143

1268456417 2736 FT0 Img 0144


[Edit: Fixed link]
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HazzWold 1993
Sat Mar 13 2010, 05:49AM
HazzWold 1993 Registered Member #2563 Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280
 		Wow you'se really went all out on this lol. that amount of primary seems unneccasery, and wouldve cost a wee bit much lol :P
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=P
Sat Mar 13 2010, 06:10AM
=P Registered Member #2736 Joined: Sat Mar 13 2010, 03:48AM
Location:
Posts: 5
 		we didn't pay for the primary. but where we left the clamp on the primary. that was the strongest spark that we was able to get from it.
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Mads Barnkob
Sat Mar 13 2010, 07:15AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		I ran your numbers through JAVATC and had to guess a few of them myself from your pictures, but seemed to work out alright. See the attached image.

Everything apears to be in order with your current setup according to the calculations.

Are the MMC capacitors heating up much? fast?

Quenching slash cooling of the sparkgap?


1268464523 1403 FT85559 Unavngivet 1
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=P
Sat Mar 13 2010, 08:12AM
=P Registered Member #2736 Joined: Sat Mar 13 2010, 03:48AM
Location:
Posts: 5
 		the capacitors doesn't seem to heat up a lot. We only run it for a few seconds. we use the light bulb to see how far the sparks can go. the video was the longest amount of time that we left the coil on. and we ended up making the bulb turn purple and die. so we have no idea why the sparks are so small. other TC generators said the sparks should be about 2'. but we are only getting about 6" max. is the toroid too big? or the amps on the transformer too small? should we have used a smaller pipe for the primary?
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dex
Sat Mar 13 2010, 10:07AM
dex Registered Member #2566 Joined: Wed Dec 23 2009, 05:52PM
Location:
Posts: 147
 		Toroid isn't too big.If the caps are ok ,then either tuning problem or the spark gap setting and quenching screw up performance so much .
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sportcoupe
Sat Mar 13 2010, 01:30PM
sportcoupe Registered Member #2664 Joined: Sat Jan 30 2010, 03:27PM
Location:
Posts: 12
 		Get your spark gap off of wood and onto something non-conductive. Wood can be very conductive depending on the moisture content. Do the same for our safety gap.
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raff
Sat Mar 13 2010, 04:14PM
raff Registered Member #2315 Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161
 		all I can say is TOO MUCH PRIMARY turns.. reDO calculation with 4-5Turns o primary and adjust primary capacltor LC tank value..
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TheBoozer
Sat Mar 13 2010, 04:40PM
TheBoozer Registered Member #1535 Joined: Wed Jun 11 2008, 11:37PM
Location: Northeastern Pennsylvania - USA
Posts: 117
 		If you are local to me, you can pick up a free 9kv 60ma nst here. A little extra power may help. :)
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Mads Barnkob
Sat Mar 13 2010, 10:21PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
raff wrote ...

all I can say is TOO MUCH PRIMARY turns.. reDO calculation with 4-5Turns o primary and adjust primary capacltor LC tank value..

10 turns is in no way unordinary for a SGTC
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