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Forums
4hv.org :: Forums :: Tesla Coils
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Spark gap Tesla coil STILL not working...

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Tetris
Thu Jul 11 2013, 04:30PM
Tetris Registered Member #4016 Joined: Thu Jul 21 2011, 01:52AM
Location: Gainesville, FL
Posts: 660
I know that feel >.>
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the mad scientist
Fri Jul 12 2013, 06:35PM
the mad scientist Registered Member #3768 Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
Here is my schematic: Link2
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Feathers
Fri Jul 12 2013, 10:42PM
Feathers Registered Member #10052 Joined: Thu Feb 07 2013, 11:31PM
Location: Overland Park, Kansas
Posts: 78
Edited:

Fantastic, but you still haven't checked your NST as we've suggested several times. Please do so. That is likely your problem.

What is the secondary grounded to, and what are you using for the caps in the filter circuit? If they failed short, the NST will happily push current through them instead of your primary circuit.

9273145990 5f7b64493f
THING by HighVoltageFeathers, on Flickr
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the mad scientist
Fri Jul 12 2013, 11:06PM
the mad scientist Registered Member #3768 Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
Details on those caps can be found here: Link2
and the secondary is grounded to a long piece of chicken wire above ground (counterpoise) or sometimes a stake driven like 3 feet into the ground.
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Feathers
Sat Jul 13 2013, 12:45AM
Feathers Registered Member #10052 Joined: Thu Feb 07 2013, 11:31PM
Location: Overland Park, Kansas
Posts: 78
Well you sure didn't fry those.

The only thing left to check is the NST!!!!

I know the sick feeling that comes from frying a piece of equipment like that. But the sooner you check, the sooner you can have a running coil! I've fried many NSTs before, and it is an easy mistake to make, especially without that safety gap. Link2

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the mad scientist
Mon Jul 15 2013, 09:50PM
the mad scientist Registered Member #3768 Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
HighVoltageFeathers wrote ...

Well you sure didn't fry those.

The only thing left to check is the NST!!!!

I know the sick feeling that comes from frying a piece of equipment like that. But the sooner you check, the sooner you can have a running coil! I've fried many NSTs before, and it is an easy mistake to make, especially without that safety gap. Link2


I will test it when I get back from vacation, I have a feeling that it still won't work even after that test :/.
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Feathers
Tue Jul 16 2013, 04:52PM
Feathers Registered Member #10052 Joined: Thu Feb 07 2013, 11:31PM
Location: Overland Park, Kansas
Posts: 78
Not sure why you'd have that feeling.

If your schematic is accurate, and your NST tests okay, it should at least do something. If not, I'm not sure we can help you with the information provided.
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the mad scientist
Sun Jul 21 2013, 08:11PM
the mad scientist Registered Member #3768 Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
Maybe the problem is the ground, should I use the house's ground as an RF ground?
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Feathers
Mon Jul 22 2013, 05:33AM
Feathers Registered Member #10052 Joined: Thu Feb 07 2013, 11:31PM
Location: Overland Park, Kansas
Posts: 78
Well if your spark gap is doing nothing, then grounding is not presently the problem.
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the mad scientist
Mon Jul 22 2013, 05:54PM
the mad scientist Registered Member #3768 Joined: Tue Mar 22 2011, 12:46AM
Location:
Posts: 107
My spark gap is working fine. It sparks.
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