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4hv.org :: Forums :: Projects
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Small SGTC.

Author Post
Duncan
Thu Feb 15 2007, 03:51AM Print View
Registered Member #524
Joined: Thu Feb 15 2007, 03:28AM
Location: Sydney, Australia.
Posts: 21
A few months ago I started making some rough plans for a new small spark gap coil, as I felt I had been deprived long enough What I wanted to achieve was a small, lightweight and reliable coil that I can pull out every now and again for a run. I wanted it to be as hassle-free to set up as possible, and should need very low maintenance. I also wanted it to look nice and neat (so other family members wouldn't make me keep it out in the shed). My starting point was a 7.5kV 25mA NST I bought off the net, and a couple of wooden chopping boards from the local supermarket

I've been saving these little updates for a while, so here they are:

Cut the handles off two wooden chopping boards and rounded the edges to make it look like the handles were never there (which took ages). I cut some pine doweling into 125mm lengths and drilled some countersunk holes in the boards and screwed everything together with heavy duty galvanised screws, and it is as solid as a rock. It turned out to be heavier than I thought it would be, but that's no problem.

Here's a couple of pics (they're a bit dodgy, but you get the idea). Theres a bit of lens distortion which makes the back left doweling support look crooked, but it really isn't.





Duncan.
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Duncan
Thu Feb 15 2007, 03:55AM
Registered Member #524
Joined: Thu Feb 15 2007, 03:28AM
Location: Sydney, Australia.
Posts: 21
The perspex arrived and I've drilled a 60mm hole in it and another one on top of the frame (so thay they'll line up when the perspex is placed on top of the frame.) The hole is for the secondary coil to go through so it will be able to sit nice and solid in the frame, and can also be removed easily if need be. I've also cut the PVC for the secondary coil, and spent about 2 hours winding the 0.2mm copper wire. There are approximately 1040 turns in total. Here are a few pics:
















Duncan.
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Duncan
Thu Feb 15 2007, 03:59AM
Registered Member #524
Joined: Thu Feb 15 2007, 03:28AM
Location: Sydney, Australia.
Posts: 21
Finally got around to finishing most of the capacitor bank. Here are a few pics:



















Duncan.
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Duncan
Thu Feb 15 2007, 04:01AM
Registered Member #524
Joined: Thu Feb 15 2007, 03:28AM
Location: Sydney, Australia.
Posts: 21
Finished soldering all the bleeder resistors onto the caps. The cap bank is finished now.












Duncan.
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Hazmatt_(The Underdog)
Thu Feb 15 2007, 06:27AM
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: CLASSIFIED TOP SECRET FOUO
Posts: 1645
Use the Attachments thread to add pictures, then you can post all your pictures at a later time in the same thread. Otherwise, good job!
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uzzors2k
Thu Feb 15 2007, 08:58AM
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Joined: Thu Feb 09 2006, 04:57PM
Location: Asker, Norway
Posts: 1308
Wow, thats clean. Looks good.
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Duncan
Thu Feb 15 2007, 09:10AM
Registered Member #524
Joined: Thu Feb 15 2007, 03:28AM
Location: Sydney, Australia.
Posts: 21
Hazmatt_(The Underdog) wrote ...

Use the Attachments thread to add pictures, then you can post all your pictures at a later time in the same thread. Otherwise, good job!

Thanks Hazmatt, I've updated my original posts with proper linked thumbnail pics.

uzzors wrote ...

Wow, thats clean. Looks good.

Thanks uzzors. Yeah the thing I'm trying to do with this coil is make it as nicely made as possible so a) I'll be allowed to keep it in the house, and b) Will hopefully be something cool to look at when it is and isn't powered up.

Duncan.
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Duncan
Fri Apr 13 2007, 01:54PM
Registered Member #524
Joined: Thu Feb 15 2007, 03:28AM
Location: Sydney, Australia.
Posts: 21
OK, I've finally gotten around to wiring everything up and giving it a test run. It appears to work well, with streamer length between 30 and 40cm. It does appear that I'll need a toroidal topload, as the spherical one is a bit lacking in terms of shielding. Anyway, here's a couple of pics and a link to a video taken shortly after first light.







And a short video:


Duncan.
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Hazmatt_(The Underdog)
Sat Apr 14 2007, 02:35AM
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: CLASSIFIED TOP SECRET FOUO
Posts: 1645
Nicely done.
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Coronafix
Sun Apr 15 2007, 12:42AM
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 935
Beautifully neat and effective coil Duncan. Can you give
us some specifications on it? What's the transformer rating?
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Duncan
Mon Apr 16 2007, 02:48AM
Registered Member #524
Joined: Thu Feb 15 2007, 03:28AM
Location: Sydney, Australia.
Posts: 21
Oh yeah, how could I forget to provide the specs The NST is 7.5kV 25mA, cap bank is two parallel strings of nine 0.047uF 1500V polypropylene axial caps (each with its own 0.5W 10M metal film resistor). The secondary is 60mm diameter PVC wound for 9" with 0.2mm magnet wire (I think that's 32G). The primary is 12 turns of 8G OFC, with tapping points cut in the insulation every half turn. The topload is a 10cm stainless steel candle holder I found at the local hardware shop

Duncan.
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vasil
Mon Apr 16 2007, 08:12AM
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
Very nice looking project Duncan! Congratulations!
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Sulaiman
Mon Apr 16 2007, 09:22AM
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 2739
Yes, nice job, well done.

I'm inspired to make a small SGTC myself

(possibly in time for the new millenium due to severe poly-projectitis)
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Marko
Mon Apr 16 2007, 11:27AM
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Very beautiful, and looks efficient as well for that small NST!

Have you considered upgrading your SG to a multigap? 16inch sparks are still great considering 22 inch maximum for your transformer.

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Duncan
Mon Apr 16 2007, 03:13PM
Registered Member #524
Joined: Thu Feb 15 2007, 03:28AM
Location: Sydney, Australia.
Posts: 21
I have considered a multigap yeah, that will be a project for next holidays I'll also look into getting myself a proper spun toroid from somewhere, as the sphere isn't all that great. However, I have added a more stylish breakout point to the spherical topload today to help keep the streamers 'under control'. Makes it look a bit evil also I think







Duncan.
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Vaxian
Wed Apr 18 2007, 05:31AM
Registered Member #635
Joined: Tue Apr 10 2007, 01:56AM
Location:
Posts: 85
Yes, congrats, Very cool looking coil.
The boss should let you display it in the living room!

My boss has banned me to the garage, which is OK, there's more room out there anyways!

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Dalus
Wed Apr 25 2007, 08:16PM
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
Damn nice coil. I wish that my coils would look as nice as yours.
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Duncan
Thu Apr 26 2007, 09:10AM
Registered Member #524
Joined: Thu Feb 15 2007, 03:28AM
Location: Sydney, Australia.
Posts: 21
Heh, it's not something you need to wish for, just spend a lot of time working on it carefully

Duncan.
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Dalus
Thu Apr 26 2007, 11:35AM
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
That's exactly what I'm going to do with my drsstc-2. The rest of my coils are build as test-beds. Hopefully I'll get the parts for my drsstc soon, I've been waiting for 0.5 years now. Damn digikey
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Andrew L.
Thu Apr 26 2007, 04:20PM
Registered Member #515
Joined: Sun Feb 11 2007, 02:06PM
Location: Slovenia/Ljubljana
Posts: 94
Duncan when are e going ot see the coil in operation?
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Duncan
Fri Apr 27 2007, 07:15AM
Registered Member #524
Joined: Thu Feb 15 2007, 03:28AM
Location: Sydney, Australia.
Posts: 21
Andrew L. wrote ...

Duncan when are e going ot see the coil in operation?


I linked a video of it in one of my previous posts
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