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Forums
4hv.org :: Forums :: Tesla Coils
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Wire size for mini SSTC

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currentkills91
Tue Aug 02 2011, 09:00PM Print
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
Would 40 gauge wire work for a mini SSTC? I wanna make a tiny SSTC but 40 gauge wire is all I have. The secondary would be about 1.5 inches in diameter and I would wind around 1200 turns. Think it would work?
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Dr. ISOTOP
Tue Aug 02 2011, 09:29PM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
Go calculate the f0 and see whether your switches can switch quickly enough...
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currentkills91
Tue Aug 02 2011, 09:34PM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
The frequency of the secondary would be just under 600 kHz with topload, and my FETS can switch as fast as something like 3 MHz. I mainly wanna know if the wire is gonna be able to hold up in this application?
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Mads Barnkob
Wed Aug 03 2011, 08:24AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
My SSTC III, that you can see here: Link2 is made with AWG38 and it was a real pain to make that secondary, on/off about 6 days.

In the end it will work fine for small systems and you will often love the tiny little coil with a low frequency that you get from it :)

Its frustrating when the wire breaks!
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Dr. ISOTOP
Wed Aug 03 2011, 09:03PM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
currentkills91 wrote ...

The frequency of the secondary would be just under 600 kHz with topload, and my FETS can switch as fast as something like 3 MHz. I mainly wanna know if the wire is gonna be able to hold up in this application?
What power FETs are you using that can switch at 3MHz? Or is this Class-E?
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currentkills91
Wed Aug 03 2011, 10:27PM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
I planned on using IRFP260 FETS, so more like 2 MHz if you do it right?
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Dr. ISOTOP
Wed Aug 03 2011, 11:38PM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
Your MOSFETS will not be very happy running at 2 MHz unless you do Class-E.
At 600 KHz, they'll be OK at low current.
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currentkills91
Thu Aug 04 2011, 03:21AM
currentkills91 Registered Member #3831 Joined: Thu Apr 14 2011, 02:54PM
Location:
Posts: 265
Yeah, the actual frequency is lower now as I got more turns than I expected. The resonant frequency without topload is a little over 800 kHz, so I'm guessing something like 500 kHz or so with topload. I wanted to do a Class-E coil, but I'm not sure that tuning would be all too easy with the equipment I have...
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