How to build a Tesla Coil

Step 2 Gather the Materials

The total cost came to around $25, being that I already had the wood, Snapple bottles, PVC, and glue.

Secondary Coil:

• A length of 1.5" PVC (the longer the better)
• About 300 feet of 24 AWG copper enameled wire
• 1.5" PVC screw-thing (see picture)
• 1.5" metal floor flange with threads
• Spray on enamel
• Circular, smooth metallic object for the discharge terminal

Base and Supra-base

• Various pieces of wood
• Long bolts, nuts, and washers

Primary Coil:

• About 10 feet of thin copper tubing

Capacitors:

• 6 Glass bottles (Snapple bottles work really well)
• Table Salt
• Oil (I used canola. Mineral oil (horse laxative) it preferable as it doesn't mold, but I didn't have any.)
• Lots of aluminum foil

And a HV power source such as a NST, OBIT, or other transformer that gives off at least 9 kV at around 30 mA.

Comments

[camokid96]

is the threading on the adapter on the ouside or the inside?

[mgfsniper]

would sea salt work for the capacitors??

[red_green]

i noticed you didn't include the nst in the parts list.
any reason for that?

[DevCoder]

Whoops! Thanks for that ;D

[nwadsworth]

fyi the "screwy thing" is called an adapter

[red_green]

Would it be possible if i used regular capacitors instead of making them out of bottles and canola oil?

[phooper1]

I believe the oil type capacitor will hold up better to the larger voltages and currents generated, I believe oil type caps can dissipate heat better than stadard caps.

[red_green]

i am asking this because i could not possibly accumulate that meny glass bottles in enough time.

[aopekun]

Is it possible to condense the fingers of electricity with a conic or parabolic mirror?
and should you add a n iron ferrite rod in the center of the secondary coil to make it more powerful?

[spark light]

You do not want to do either of those things.
there is a reason a tesla coil has no iron core, that being that it is a resonant transformer.

[sudhanshu529]

hii .... actually this is my first attempt to tesla coil ... i m doing it for my college project ... i use a secondary coil 63mm in dia , with wire .3mm thick and 1000 turns... my primary is made of 10 SWG wire with 6 turns with first dia being 160 mm and consequent turns 5mm apart .. i had ordered a transformer 220/4000V and 35mA ... i dont noe whether it is current limiting or not ... i made toroid using a 4inches aluminium duct .. 22 inches in circumference ... now a few questions :-
1) can i use a series of 400V capacitance for primary ?
2) what should be the value and current rating of my bleeder resistance ( connected accross capacitance)
3) how do i limit the current ; provided i dont noe whether my transformer can limit the current or not ... ?? if using a choke what would be a good value of the choke and its rating ??
4) can i wind primary on a wooden structure or do i need acrylic sheet or Bakelite ???
5) how do i tune my tesla coil ... i have no access to occilioscope :( :(

thanx alot BTW for sharing your experience !!!

[malik98]

my spark gap caught on fire is there anyway to fix this

[malik98]

mine won't start do you have any troubleshooting ideas

[sixpackwill]

where did you buy your wire and does it have to be a certain diameter? Also, what did you use for you discharge terminal and electric supply because its not in the materials. Thanks

[punkzter]

Can I use the flyback transformer from an old crt monitor? What would I need to change if I did this?

[DevCoder]

yeah. nothing.

[bretta]

@ electridanger same problem, but if you live near a scrap yard you could find the transformer or make a suitable one with and ignition coil. refer to http://www.instructables.com/id/Variable-voltage-ignition-coil-power-supply/ for making one cheap.

[electridanger]

honestly that makes NO SENCE

[DevCoder]

Yeah, +1 on this electridanger - an auto ignition transformer is not meant to have 120/240 volts AC thrown at it, it is meant for 12 V DC. I'm not sure what would happen if you ran that system for long, but I don't think it would end well.

[electridanger]

probably not but it would be fun lol

[bretta]

It works. I've tried it ant it produces a 1 inch spark on the highest power setting. And yes it did end well. But make sure any Transistor basedow Electronics are un hooked. It shuts them down for a day.

[electridanger]

what source of power can a 14 year old without an e bay account get that is big enough to power it

[Jimmy Proton]

i am also 14 and i dont have an ebay account eather but you can buy "buy it now" stuff without one, i do it all the time.

[electridanger]

I just dont want to spend that much money, but thanks anyway

[monkeyman2199]

by increasing the size of the pipe, and the amount of wire you used, would you be able to make this bigger, and how many capacitors would need to be used?

[tolazyonceagain]

 Anybody have links for where to buy these things?

About 10 feet of thin copper tubing
A length of 1.5'' PVC (the longer the better)
About 300 feet of 24 AWG copper enameled wire
1.5'' PVC screw-thingy
1.5'' metal floor flange with threads

[aeternusjunk]

Any hardware store (home depot) with plumbing supplies will have:
1/4" copper refrigerator icemaker tubing
lengths of PVC-DWV (It's really cheap sewage line, avoid pressure pipe $$)
1.5" PVC Male Adapter and floor flanges

Instead of the male adapter and floor flange, try a floor flange for a toilet. They glue to pipe and screw to the floor.

I got my 24 or 30 AWG wire from techfixx on ebay. Cheap.

[kelpshark]

2 questions: 1 is the wiring connected to the torrid? 2 what is the PVC screw thing used for and where?

[rob95]

 What should i use for the circular smooth object for discharge terminal
 

[derbert]

[derbert]

sorry. comment thingy broke. i've used an aluminium pie dish with a bolt going through it for mine. it possible that crinkles will give coronas that will eventually destroy the top load, but it's working for now

[Michael Roberts]

I used 28-30 awg wire, is that bad?

[derbert]

not necessarily. it should still work, but your secondary (i assume that's where you used it) is just more likely to break because of the amount of electricity going through it. thicker wire=less likely to melt. hope that helps

[Michael Roberts]

 thanks

[derbert]

no problem. also, it's possible that the thinner wire will have an effect on the inductance of the secondary, which might make your coil a little harder to tune

[bmnot]

What could i use as discharge terminal?

[bnoops]

I have 2 ?s 1st: what is the aluminum foil tube in the pics, and 2ed; why isn't the NST in the "gather the materials"

[DevCoder]

1: an artsy shot
2: idk

[chaotiix]

You said 1.5 inch, but on step three, the pvc pipe is much longer. did you mean 1.5' (foot)?

[gammaraptor]

that was the one for wrapping the secondary coil.