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Author Topic: New Tesla coil  (Read 491 times)

tkpatric

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New Tesla coil
« on: May 07, 2010, 01:46:58 PM »
This will be my new Tesla coil:
I need a little help: I want to put the primary coil IN the secondary, is this possible (or advisable) ? Please give me your opinion!

PS: this was my first coil: http://www.youtube.com/watch?v=4VO9RSRpsTs
« Last Edit: May 07, 2010, 02:07:45 PM by tkpatric »
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tube guy

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Re: New Tesla coil
« Reply #1 on: May 25, 2010, 08:25:40 PM »
yes, but that is bad. corna would build up inside of the primary form and would kill the tc :-[
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tkpatric

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Re: New Tesla coil
« Reply #2 on: May 26, 2010, 02:07:21 PM »
You are right, I will use a pancake coil. Do you know the right way to calculate the primary? The secondary is 11 cm diameter, 55 cm long with 675 windings. There is a sphere top-load of 25 cm diameter. The resonant frequentie is 276 Khz (I think...).
Thanks for the reaction and many greetings!

       
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Ryan

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Re: New Tesla coil
« Reply #3 on: June 03, 2010, 10:59:25 PM »
That looks great!

There are quite a few apps floating around the internets for calculating primary/secondary ratios.  I've seen Excel sheets that do it, you can use OpenOffice if you don't happen to have Excel.

 i'm no expert in the calculations, so i can only say good luck..

Oh, how did you find the resonant frequency?  If you're lucky or have access to a university electronics shop you should be able to borrow a frequency generator and o-scope and watch the signal drop off as the frequency reaches resonance.  That or you can use capacitance and inductance meters and then calculate it.  I think i used both methods for a little 'homebrew' one I made with beer bottles long ago.  it's always neat to watch something you made when it actually works.
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tkpatric

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Re: New Tesla coil
« Reply #4 on: June 04, 2010, 03:28:47 PM »
I used  http://www.classictesla.com/java/javatc.html (via tube Guy) to calculate the resonant frequency, but my measurements, with an oscilloscope and a frequency generator, differ a little.
Thanks for the reaction!
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tkpatric

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Re: New Tesla coil
« Reply #5 on: June 19, 2010, 05:30:58 AM »
In the mean time, I have tried the coil, and it works. I have sparks from +/- 5 inch (15 cm), but without tuning. First of all, I have to made all things safe, and I have glued some things to enforce the complete Tesla. Then I must place an isolating tube over the secondary, on the underside, to avoid sparks to the primary. The Tesla transformer is for demonstration on different places, so it must be possible to disassemble it.

The frequency is +/- 350 kHz.

PS: paraffin is a cheap method to isolate or protect or repair things like coils, capacitors, tht's aso...
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