Tesla coil Build comparison. (Proof of ability)

[Kamil]

Kamil, Very wise to be safe, I always consider safety first and every part of the primary circuit with MOT's in it is potentially
deadly. When I'm experimenting with anything to do with deadly charge on capacitor or high powers at dangerous voltages
I get myself into a routine where I turn off and disconnect the supply, then discharge all the capacitors and jumper them (shorted)
before even considering touching anything, distractions can be dangerous too.
I have 40 uF on my two MOT's to correct the power factor, which can be left with charge on them sometimes, they get 240 volts.
My primary capacitance is small because less than 20 nF due to my fairly high frequency around 760 kHz, that 20 nF gets charged
to almost double the voltage of the output of the two MOT's in series because I use a DC resonant charging circuit, without that
almost doubling of the 4000 v or so to about 7000 v my spark gap doesn't work so good, I think because of the low capacitance
and energy of the primary capacitor bank.   

Building Tesla coils is kind of a very customized thing for most, people build them for different reasons.

Spark gaps are not a strong point for me as I lack a lot of equipment and live out of town. I had to build a wooden frame rotary
spark gap to get a good output from mine. As I just found out the rotor I made from a plastic cutting board for the spark gap is
cracked now so I'll need to make a new gap of some kind.

Almost impossible to build a "safe" Tesla transformer. It's the operator who needs to be safety minded and careful.
I've got my input power restricted by a coil in series with the MOT's that has a fair bit of resistance, my next play with it
will be to remove or reduce the power restriction and fix my spark gap or build a new one, it could do with a better frame
and rotor.

..

Hi Farmhand,TinsenKoala

Thank you for the advise on capacitance and safety ,
My flyback coils never scare me but MOT is different level but if I want to go bigger/stronger then I need to try it out and see how it goes.
Will start testing ASAP and if I will find questions and problems will come back to you guys ,lucky me that I have some body to ask
The schematic which I think should be appropriate for this build:
http://isparktube.com/images/phocagallery/Schematics/thumbs/phoca_thumb_l_mot%20tesla%20coil.gif
Let me know what you think about this schematic?
Regards

[TinselKoala]

@Khamil
Yes, that's a standard dual-series-MOT SGTC design. I'm sure it will work... but please be aware that this is a _very dangerous_ design and extreme care must be taken that the secondary output discharge cannot possibly reach the primary (MOT secondary) output wiring, or the mains (MOT primary) input wiring. Once a plasma forms it is highly conductive, and even though the secondary discharge might itself be "safe" because of the high frequency and spectral purity, the plasma will happily also conduct the mains frequency high current from the MOTs if you allow it to.  Distance is your only safe insulation, and plenty of it. Do not trust insulating materials when you are dealing with voltages over 5 kV. Distance is your only safe insulation. Keep one hand in your pocket when operating (not kidding, this will prevent you from taking a shock across your chest which might kill you). Always, always, discharge your capacitors before doing _anything_ to the circuit. The very first thing you should make is a discharge wand, that you can use to short the caps to discharge them. You can see me using a small discharge wand in my Jacob's Ladder Effect of Capacitance video, for example; and also a long screwdriver with a well-insulated handle can work well for this purpose, as I am using on my TKVIII work.
If this is your first large or mains-powered TC... you must be very very careful, because your first mistake will likely be your last one. The dual MOT-powered coil is much more dangerous than current-limited NST powered coils are, even though the NST makes higher voltage.

Distance is your only safe insulation. Keep one hand in your pocket. Make a discharge wand before you do any energizing of HV capacitors. And tell someone what you are doing and have them check on you while you are working with this kind of apparatus.

And be sure to take plenty of pictures of your build, and of the spark output! I wish you the best of luck, safety and fun! Distance is your only safe insulation!
--TK