Instructables
Picture of MINI TESLA COIL 50KV!!!! (revised)
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On my last instructable about my mini Tesla Coil I did not do so well because I did not know much about them but since then I have learned much more and have batter plans.

How it works: First off the mains goes through a high voltage transformer and charges the capacitor bank. When the caps are done charging they will let the high voltage from the transformer "pass" through them. During that split second (much to fast for a human to detect) the arc will jump through the spark gap, which is automated with RSGTC's, the caps will discharge into the primary coil. This is where resonance comes in, the fast action of the caps and spark gap rapidly induces an electromagnetic field around the primary, what many dont know is it starts off as a low voltage that adds up each time the spark gap fires until it creates extra high voltage

-=This project deals with high voltage that could potentially be lethal, do not touch the streamers unless you know what your doing=-

-=never operate high voltage equipment before turning it off=- 

-=I will be some information from my other instructable=-
 
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Step 1: You will need

Picture of you will need
1' tall 1/2" diameter PVC pipe or other non conductive cylinder 
about 5' of speaker wire, I didn't have enough of the thicker gauge wire
8" tall 1" diameter PVC pipe, you can use something a little wider but I couldn't find anything
10kV 23mA ignition transformer, you can get them on eBay for about $20-$40
15 1kV 0.01uF film capacitors
about 300ft of 32 awg mag wire
some 18 awg solid copper wire to connect everything
2 round headed bolts or "i" screws, try to keep them as smooth as possible 
a 10"x4" piece of wood
copper connectors or some 1" bolts with nuts
a drill with various sized bits
a hot glue gun
a soldering iron, with solder

mannray5 months ago
I built a big one
OVERLOADED2 years ago
Jimmy are you still on instructables? I have been trying to reach you and left many comments about your 100kv EB driver. can you pls reply if your still taking on questions here thx.
Techno Dude2 years ago
Do u know someone who can help me
Jimmy Proton (author)  Techno Dude2 years ago
Can you read schematics?
Techno Dude2 years ago
I want to know how to connect 555 timer with ignition coil,because I tried another ignition coil driver,
but it dint work why can some one pleas help me?
Jimmy Proton (author)  Techno Dude2 years ago
I didn't use an ignition coil, I used an ignition transformer. there's a difference. but I've never made an ignition coil driver so I don't know how to help.
Bumba Lodh2 years ago
Hi,I built a TESLA COIL with 5kv 30ma nst.Primary coil made with 4mm
copper tube with 10 turns secondary made with 2inch PVC pipe.Winding
height 10.2inch(0.315mm enameled copper wire used) also made Capacitor
bank with 2kv 0.15uF polyester film capacitor.But the problem is my
Capacitor burnt several times but the coil works with LEYDEN JAR
capacitor.Why the capacitor burning??????


Please Help Me!!!!!!!!!!!!!!!
techxpert3 years ago
boooooooooooooooooooooooooooooooooooo
ooooooooooooooooooooooooooooooooooo
oooooooooooooooooooooooooom!
Techno Dude3 years ago
can u tell me the connect of the 555timer and ignition coil?
Bumba Lodh3 years ago
I've bought 5Kv 30mA NST at 35$. Please tell me how many capacitor needed?

Here is Some Formula that can help you
1. calculate the resonant frequency of the secondary circuit:
f = [2π√(L(Ccoil+Ctop))]^(-1)

2.The primary coil forms an LC oscillator together with the capacitor. The desired inductance can be calculated with the following formula: L = [(2πf)2C]^(-1) C is the capacitance of the tank capacitor and f is the resonant frequency of the secondary coil.

3.The resonant capacitor value for the power supply can be calculated with the following formula: C = I ⁄ (2πfU)

and Visit http://www.richieburnett.co.uk/resonant.html

hope it may help you
josh13243 years ago
Amazing! 5*s!
Bumba Lodh3 years ago
i want to say can i use transformer(I Found it from my Old CD player) coil's wire to make primary coil
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Jimmy Proton (author)  Bumba Lodh3 years ago
If you unwind the wire from the transformer then it could work but its good to use thicker wire.
Bumba Lodh3 years ago
how to make a toroid
Bumba Lodh3 years ago
I've large amount of 200volts ac to 12 volts step down transformer coil. can i use it for make secondary coil
Jimmy Proton (author)  Bumba Lodh3 years ago
I'm not sure what your asking.
Techno Dude3 years ago
why do u need an 555 timer
Jimmy Proton (author)  Techno Dude3 years ago
Because transformers cannot run on smooth DC so you use an oscillator (555 timer) to disrupt the current and then you are able to drive a transformer.
Techno Dude3 years ago
so I was thinking of making a tesla coil using battery and ignition coil do I need a 555timer
Jimmy Proton (author)  Techno Dude3 years ago
Not necessarily as there are different kinds of oscillators that can be used to drive an ignition coil. Here you can find a ton of schematics.
sguy13 years ago
i am working on one of the teslacoil medium sized. but i don't know which part should i ground? is it the capacitor! or the primary coil or secondary coil? or none!
i again want t0 ask again one question
do we have to connect primary coil and secondary coil? i just don't get this part! how primary coil gets that enormous amount of voltage! is it because of the magnetic field due to secondary coil as you mentioned above!
please do reply soon because the science exhibition for high school is soon in my town.
Jimmy Proton (author)  sguy13 years ago
The bottom of the secondary is grounded and the primary gets its power from the discharge of the capacitors.
.Unknown.3 years ago
Do you still need RF chokes like the last tesla coil you did?
(http://www.instructables.com/id/MINI-TESLA-COIL/step7/RF-chokes/)
Jimmy Proton (author)  .Unknown.3 years ago
No, you don't even need them in the other one, its better without them.
baker amin3 years ago
Hi. thank you for this instructable. if you want to know the equation you talked about in step 3, then download this program from this link

http://www.richardsplace.net/files/tccad20.zip

this program is called "Tesla Coil CAD" and its uses to designing tesla coils.
Hope you like it.
And I have a question. did you make it from the first time. I mean did it work from the first attempt??
Jimmy Proton (author)  baker amin3 years ago
That program did not give an equation, just a calculator.
Jimmy Proton (author)  baker amin3 years ago
Thanks, and yes it worked the first time I powered it up.
Good job, this is one of the best instructables about Tesla coil I have seen.

I understand how the primary part work, but i don't get it for the secondary, an end of the coil has to be wired with the earth (something like a radiator?)?So the circuit is open, why is there a current and how can it produce an arc?

I'd like to build one but i'm a little concern about safety, I was really surprised when i saw you "touching" the arc, why doesn't that hurt you? I thought HV was dangerous.

Sorry if my english is not correct but it's not my mother tongue.
Jimmy Proton (author)  Incandescence3 years ago
Thanks!
Grounding is usually only used for larger Tesla Coils like the one I'm working on now but this thing is so small it doesn't really matter.
When the spark gap fires all the capacitor energy is released into the primary which makes a magnetic field that is picked up by the secondary. The primary induces more and more voltage each time it fires, it starts out low and builds up very high each time and if you know much about high voltage it tends to make sparks.
There is very little output current so it wont hurt to touch it like that and you cant hardly feel it (you can a little bit) and if your not touching anything connected to ground or something else on the Tesla Coil then you'll be fine because it never leaves your body and even if you were it still probably wouldn't hurt you.