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RE: [TCML] Turn-to-Turn short circuit
Hello Matthew,
The problem with your calculations is that, with a Tesla coil, you're going for resonance. You want to have your primary resonant with the secondary, and it appears that this would not be possible with a ten-turn primary of reasonable size. The resonance from primary to secondary is what gives you the real output of the coil, and not the transformer ratio.
The wire you have WOULD be suitable for both the choke and the secondary, but I suggest thicker wire to make the project easier and reduce the likelihood of arc-overs on your choke.
With 36AWG wire, for your secondary, you'll want to use six to twelve inches of winding, but I'm not 100% sure of this, because I'm not in the mood to do the calculations. I advise, for the secondary, using around 1000 to 2000 turns, because, apparently, for most coils the length of wire is close to quarter-wave-length of the resonating wave. Some coilers think that there's nothing to this, but some go through great frustration in order to get near that length of wire. Believe what you will, 1000 to 1600 turns seems to be what all of the coilers are using, and it works well.
I'm assuming you're using a 10KV 23 or 20mA OBIT; is that correct? If it's not correct, it will have little effect on the outcome, unless you're planning on using a PT or a pig, or something with a bit of 'oomph' on this little secondary coil I'm suggesting.
I would also suggest either putting the chokes under oil if they get corona on them or coating them in epoxy. Just run the spark gap in an enclosure so that you can't really see the light coming from it at night and look to see if there's any purple coming off of the choke.
Feel free to ask me questions on the list or via PM all you like.
Good luck!
Christopher Karr
> Date: Fri, 20 Mar 2009 13:33:28 -0400
> Subject: Re: [TCML] Turn-to-Turn short circuit
> From: truesoutherngeek@xxxxxxxxx
> To: tesla@xxxxxxxxxx
> CC:
>
> OK. Thanks for all of your help, everyone. (Buy the way, Mr. Karr, it was
> your instructions that I used, but it would appear that I didn't use the
> right kind of wire). I am going to rewind both chokes, using magnet wire. I
> do have a question about the gauge of the wire, though. What is an
> acceptable gauge for, not only the chokes, but also the Secondary Coil? I
> have access to a whole bunch of (the right kind of) 36 gauge wire, and was
> wondering if that would work. I was thinking it would for the coil, but not
> for the chokes. My secondary coil tube is 2.25" in diameter, and I will be
> using 8-10 turns on my primary. I was thinking 5000 turns for the secondary
> coil, which, if my math is correct, would equal 2943.75 feet of wire. If I
> did my calcs right, with 8 turns on the primary, this would put my output
> voltage up to 5,000,000 volts (ideally). Just wondering if the wire would
> (safely) work!
>
> Thanks,
> Matthew
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