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Author Topic: Need Your Help Please In My Tesla Coil !!  (Read 3899 times)

Offline tareef

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Need Your Help Please In My Tesla Coil !!
« on: 19/03/2009 22:05:21 »
Hi,
Am Tareef, me and my friends were interested in building a Tesla Coil, and so we did one, but actually after we finished assembling and fixing the parts together we noticed that while we were testing it, the sparks only came out from the spark gap, and nothing came out from the toroid, we spent hours trying to know why that happened but we reached to nothing
so for that am asking you if you can help us by giving us an advise.
by the way i will provide you with some videos, so it can be easier for you to know whats happeneing.

The First Video Shows All The Wiring We Made
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The Second Video Shows Whats Happening With Us
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))


note: you will notice that in the wiring video that the is a copper coil on the ground, actually we put id there and we connected it with a wire for grounding, and that wire is connected to a steel pipes used for the fire fighting in our building.
hope the information which i gave to you is enough.

Waiting Your Advice,, Thanks Alot
Tareef


 

Offline daveshorts

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Need Your Help Please In My Tesla Coil !!
« Reply #1 on: 19/03/2009 22:16:13 »
I have never built a tesla coil but have looked into it so I am just guessing.

Have you tuned your primary winding's resonant frequency to be that of your secondary?
 

lyner

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Need Your Help Please In My Tesla Coil !!
« Reply #2 on: 20/03/2009 00:06:01 »
I /we have made one, in the past, with a beefy, self oscillating, radio transmitting valve. Its performance was very dependent upon dimensions. What RF frequency are you using? Ours was around 150kHz, I seem to remember and the primary coil was something like five turns of thick conductor and a huge, high voltage capacitor (no idea the value). Tuning was critical as was the length of the secondary. Making it longer than, perhaps, 80cm was counter productive.
 

Offline syhprum

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Need Your Help Please In My Tesla Coil !!
« Reply #3 on: 20/03/2009 17:32:55 »
The resonant frequency of a long single layer coil approximates to the wavelength of the wire used in it (ie if you used 100 meters of wire the resonant frequency would be 3MHz).
Telsa coils work best at fairly low frequency but beware of ruining the cricket commentry from the 198KHz broadcasts, that's why they tend to be large.
Some top loading capacitance will lower the frequency but will produce a narrower
resonance.
You could measure the resonant frequency by injecting spark into the low section of the coil and looking what pulses come out with a radio receiver or oscilloscope.
You could of course abandon 19 century technology as Sophiecentaur suggested and use a valve
« Last Edit: 20/03/2009 17:38:27 by syhprum »
 

Offline yor_on

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Need Your Help Please In My Tesla Coil !!
« Reply #4 on: 22/03/2009 22:48:53 »
You can look here perhaps.
http://abelian.org/tssp/index.html
 

Offline syhprum

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Need Your Help Please In My Tesla Coil !!
« Reply #5 on: 22/03/2009 22:58:25 »
I don't think Mr Tesla or Sophicentaur would have attempted to make one if they had realised how complex it was.
 

Offline yor_on

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Need Your Help Please In My Tesla Coil !!
« Reply #6 on: 25/03/2009 12:56:36 »
Yep, scares me sh**less that link:)
 

lyner

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Need Your Help Please In My Tesla Coil !!
« Reply #7 on: 29/03/2009 13:12:24 »
You can look here perhaps.
http://abelian.org/tssp/index.html
I remember similar problems with hellical antenna design.
It used to be - start with a quarter wave wire, coiled up and stretched a bit - then add or take away some wire until it works best!
Then they found computers would work well and fast.
 

Offline syhprum

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Need Your Help Please In My Tesla Coil !!
« Reply #8 on: 29/03/2009 21:38:17 »
I believe with a helical antenna you need several wavelenghts of wire with each turn taking one wavelength rather like a rhombic. 
 

lyner

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Need Your Help Please In My Tesla Coil !!
« Reply #9 on: 29/03/2009 23:20:14 »
Well, the helical ones used for UHF (referred to as dildos) were only about 10cm long and had a diameter of about 15mm with a fairly open pitch. I guess there's range of possibilities.
Ah, Rhombics. Beloved of Monitoring. Well behaved and predictable.
 

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Need Your Help Please In My Tesla Coil !!
« Reply #9 on: 29/03/2009 23:20:14 »

 

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