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4hv.org :: Forums :: Tesla Coils
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My first tesla coil(SGTC)

Author Post
Michalis.Biochem
Sun Jan 30 2011, 10:35AM Print View
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Posts: 69
Some days ago i decided to dig up my plans about building a tesla coil that i couldn't finish in the past. This time i think it is going to be easier, since i am more motivated an relaxed.
So, up to now i have made the driver circuit. It consists of a camera flash board, power by 2xAA batteries, which in turn powers a CW voltage multiplier(10x1nF@1000V caps. 10xUF4007 diodes and a 1kΩ resistor).
The Hv out and the GND wire produce a nice small arc about 5mm.
According to Dr.2N3055 this is about 8000V when the cw voltage multiplier is a 6 stage one and since mine has 5 stages the output would be a bit lower than his.
So my questions are the following. Do i have to add another stage to the voltage multiplier or is it fine that way? How do i construct the coil(diameter, number of windings of the secondary and primary coil, former material etc.)? Am i going to need a toroid?

Here is the original post by Dr.2N3055.




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Dr. ISOTOP
Sun Jan 30 2011, 11:14AM
Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
IMHO such an exotic project is not a good way to get started with coiling. At such tiny powers, any losses become significant, and it is difficult to achieve output.
You're better off with a flyback powered coil, or better yet a coil powered by a 9KV/30mA NST.
If you want to figure out the parameters for this coil, use JAVATC.
If you can make a spark gap that functions at your voltages, you do not need a 6th stage.
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Michalis.Biochem
Sun Jan 30 2011, 02:20PM
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I would prefer a bigger and more powerful coil as well, but since i am a newbie, getting away with minor burns seems better than having a major accident.
As a matter of fact, i've already got a flyback and all the components for a ZVS but i am not going to construct it until i have enough experience in the field. I am a bit afraid of such high outputs.
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Michalis.Biochem
Mon Jan 31 2011, 03:50PM
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So, i got secondary former with diameter 4cm and height about 30cm. It is going to have about 600 windings of 0,2mm wire. The primary coil consists of 6 windings of about 1mm wire. It has a diameter of about 6cm.
I hope they are ok
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Dr. ISOTOP
Mon Jan 31 2011, 04:06PM
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Posts: 652
Well, now that you have your primary and secondary wound, you need to compute the size of the capacitor such that the primary and secondary will form a resonant circuit.
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Michalis.Biochem
Mon Jan 31 2011, 04:52PM
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bwang wrote ...

Well, now that you have your primary and secondary wound, you need to compute the size of the capacitor such that the primary and secondary will form a resonant circuit.


How do i do that?
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HV Enthusiast
Mon Jan 31 2011, 07:59PM
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Check out my paper on How to design tesla coils. It can be found here:



This is a pretty no-nonsense method of designing a simple SGTC.
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Michalis.Biochem
Mon Jan 31 2011, 09:12PM
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Sooo, i Think i made a tesla coil. I havent installed a topload though. I powered the thing up and when i got the 2 wires that protrude from the coi, near each other a faint arc appeared. But, when i got one of these 2 wires near the coil a larger arc appeared. Almost 3cm. Is that even normal?
Oh, and btw one of my hard drivers rebooted for no apparent reason.
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Michalis.Biochem
Mon Jan 31 2011, 09:14PM
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Joined: Wed Oct 20 2010, 07:28PM
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Posts: 69
EastVoltResearch wrote ...

Check out my paper on How to design tesla coils. It can be found here:



This is a pretty no-nonsense method of designing a simple SGTC.



Oh, and thanks for the info!
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Michalis.Biochem
Tue Feb 01 2011, 09:59AM
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Joined: Wed Oct 20 2010, 07:28PM
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Posts: 69
I also want to add an rf choke. I read that it need to be installed on th hv out of the transformer. Since my xformer connects directly to cw voltage multiplier, do i have to connect it on the hv out of the voltage multiplier or the xformer's?
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