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aris

Mon May 24 2010, 03:06PM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81

can i coonect the secondary coil to the ground of my house power supply?

quicksilver

Mon May 24 2010, 04:02PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

Grounding of Tesla Coils is subject to a great deal of opinion. Therefore the need to really research for yourself what is needed. Some of this depends on the size of the coil.
Some opinion is that the only part of a small coil that damn well needs to be grounded is the parts that you may touch: the variac, switches, etc. Others state that RF grounds need to be accounted for & that any RF ground should be separated from the house as the possibility of a sharp projection could allow a spark to contact flammable or sensitive material.
On the Primary side of the coil are the most likely to contain lethal voltages/current. HOWEVER, that is NOT always the case!
There is SO much opinion & variance in coils per se' that only you can determine what type of grounding would be needed and where.
The most helpful suggestion is that you do this research for yourself; as it has just too many idiosyncrasies that only you would know.
Additionally, the question arises as to what IS a small coil? Is it a physically small coil of say 6k / 20ma? or is it a 9k @ 30ma???, etc, etc. Would it be beneficial to completely ground any coil? There are different opinions. But aside from all that; anything that you may touch always needs a ground.

This gentleman built a small coil:

And with that had some unique responses (and opinions). Read and study all you can to satisfy some of the basic elemental questions and practice solid HV safety agenda: but DO IT! Nothing teaches like experience.

aris

Mon May 24 2010, 07:07PM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81

but i see in some video people to have the tesla coils in their house how they connect the coil to te ground rod?IS it possible to make a metalic structure as a ground and keep it safe in an insulating space?

Goodchild

Mon May 24 2010, 07:10PM

Registered Member #2292 Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795

I personally ground my smaller coils to the house ground ive not had any problem with it so far. (and some of my small coils throw 5 foot arcs

)

aris

Mon May 24 2010, 07:26PM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81

when you say small you mean how many volts?One more stupid question is that my flyback transormer has 3 wires.First and thicker says 40kvdc the second 20kvdc and the third and thinest 1,2kvdc 1kvac.How i can know what is transformers output and with what inpute volt i can take it?Also has two switchers (screen and focus).Can i regulate the output voltage with them?(i maybe became boring but i am thurst for knowledge:P)

Goodchild

Mon May 24 2010, 07:49PM

Registered Member #2292 Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795

First off you can totally use the house ground for a flyback coil no problems there (have been there before

)
BTW with is running on the houses RF ground:

Your flyback should have one big (usually red) wire, thats the HV output you will have to experiment to find the HV return on the bottom of the flyback.
as for the primary I suggest winding your own on the ferrite core. If you have a pic of your flyback I may be able to help you further.

aris

Mon May 24 2010, 08:16PM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81

Your fbt how much volt have output and how much volts you supply it?I attached some photos to see the 3 wires and if you can explaine me from what wire i can supply it and what wire i use to take the hv(and how much hv) i would be very happy:P

[Edit: Picture size]

Goodchild

Mon May 24 2010, 08:22PM

Registered Member #2292 Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795

Ok so like I thought you have a DC flyback, ok so the big red wire is the one you want, the wight and orange wire you can cut off. One of the pins on the bottom is the HV return
there is really no way of knowing which one till you get the thing working. The way you will find the HV return is by seeing which pin the big red wire arcs to.

My next Question for you is do you know how to driver a flyback? If not I have a suggestion on how to drive them.

803

Mon May 24 2010, 08:27PM

Registered Member #2807 Joined: Fri Apr 16 2010, 08:10PM
Location:
Posts: 191

the 20k and 1.2 k are the screen and focas outputs, cut them off and seal them with hot glue. they aren't important. the 40 k is the one you want to use as the hv+ the hv - is one of the pins, experment to find out.

hope this helps,

Paul

aris

Mon May 24 2010, 08:30PM

Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81

i dont know:(i am new in hv hobbys!!I can take 10-15 kvdc or only 40kv?Generaly i need a little help about this transformer!

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