How To Make A Jacobs Ladder

How To Make A Jacobs Ladder


This instructable will show you how to make a fully working Jacobs Ladder.
You may have seen Jacob ladders in those old Frankenstein movies where you see electricity travelling up two wires disappearing then re appearing at the base of the ladder.

WARNING: This project uses HIGH VOLTAGES which can kill you. I wont say don't try this at home as it is a fun project but be EXTREMELY careful.

Also This is my first INSTRUCTABLE.

Please feel free to leave comments.
 
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Step 1Your Components

Your Components
1x Transformer. (Should be at least 9kv. My one is a 12KV one which i got free from a neon sign shop. If you say your making a Jacobs ladder they will usually give it to you for free or for a low price.)

1x 2m extension cord

Insulation Tape

Copper wire

Ordinary Steel Wire

A base for mounting everything

Screwdriver

Wire Strippers and a scissor
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60 comments
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Jan 21, 2012. 6:33 PMkdbacho says:
will your transormer work if it says "secondary ground fault protections"
Aug 31, 2009. 5:41 AMo0JohnnyReb0o says:
you say that they will give it for free if we say it's for a jaccob ladder but I said it and the womand looked me strangely and asked me why I would like this then she said me it cost 140 euro...
Jan 15, 2012. 7:19 AMsspence says:
For a used one?
May 31, 2011. 3:24 AMjpoopdog says:
12,000v@0.03A = 360 watts

this thing will take quite alot of power,
are you sure it outputs 30ma?
and doesnt just take in 30 ma?
Jan 15, 2012. 7:18 AMsspence says:
Transformers are about 96% efficient, so there's not a lot of difference between input and output.
Jan 12, 2008. 2:00 PMEinsteins Circuitry says:
I'm surprised that they gave you the transformer for free. Where did you go?

PS: Nice Instructable. +1 and favorited
Jan 25, 2008. 7:08 PMEinsteins Circuitry says:
Yay! I just found a small store that was willing to give me one for free! only 9kv but still! I'm glad I didn't buy one on ebay.
Nov 29, 2011. 10:23 AMsspence says:
Oil furnace repair shops may give you free OBITS. I have a pallet full of OBITS that were on their way to a dumpster.
Jan 15, 2012. 3:35 AMEverfalling says:
what's an OBITS?
Jan 15, 2012. 7:16 AMsspence says:
oil burner ignition transformer's
Dec 31, 2011. 8:59 AMAlex1M6 says:
Like mine?

Jul 31, 2011. 11:44 PM1stcontact says:
Does the diameter of the rods matter to the output of the transformer and can I place a plexiglass tube around the rods for safety? Oh also does it matter what metal the rods are made of?
Feb 3, 2010. 2:18 PMhistory323 says:
"guaranteed to impress family member'
Haha i would probably get kicked out of the house.... But cool instructable I will try it anyway!
Jul 3, 2008. 6:19 PMimgod22222 says:
What would you say is the max/min current you'd want for this project?
Jun 25, 2009. 7:24 AMchriskarr says:
I wouldn't say over-kill, the larger the mA rating, the wider the arc can grow to be. If you have two, try to put the primaries in parallel and the secondaries in parallel on two transformers that have the same voltage rating. This will add their mA rating and keep the voltage rating the same. But, they MUST be the same voltage rating, even if not identical. I have a setup, right now, with one modified Franceformer (I modified it by removing the GFI unit) 9KV/60mA NST in parallel with one 9KV/30mA NST, essentially giving me 1.5X the power I had before. My arcs don't start at a much closer distance, however, the arcs do pull to a much longer distance. The 10KV/cm is the rule for starting the arc, but after that it's the current of the transformer that keeps the arc going. If you do try what I recommended, I also recommend a variac to ramp up the power to 0.5 input power, if possible. If this isn't possible, I suggest just plugging it in normally. If you end up with a transformer that won't arc from one side to the other very well, you probably don't have the transformers in phase. Switch around the primary connections on one of the NSTs, and you're all fixed. If you'd like to know more, PM me.
Jun 19, 2008. 11:15 AMcowboy4884 says:
Ive made different jacobs ladders using different transformers ranging from 7.5 KV to 50 KV. They all work basicly the same just a fatter arc as the voltage goes up. Ive always wanted to put together a jacobs ladder that would arc 5 to 10 foot accross. Any Ideas?? Ken
Jun 25, 2009. 7:16 AMchriskarr says:
You can't link NSTs in series, since they have the center-tap on the secondaries. It makes things horribly inconvenient for guys like us, but they make it cheaper to make the NSTs for companies like Franceformer. If you need to link transformers in series to get a high-power supply, I would recommend MOTs ran off of a 220 source with a high-potential step-down transformer to bring the voltage down to 110/120V (If your microwave was made for 120, that is). This will allow you to have a higher output power (in KVA or KW) on one circuit. Parallel the MOT primaries, series the MOT secondaries and pray to God that you don't kill yourself on the exposed cores. Then, hook it up after the stepdown transformer and there you will have it. A 1A however-many-KV-you-decide-it-should-have power supply. I recommend going for 100 MOTs in series. That would definitely be a world record and would give you 200KV...Although I do suspect that you might have insulation issues at that point. Why not just get an X-Ray transformer rated for 100KV and put in an external series resonant capacitor? It will pull more current, so you'll also need a PFC cap (Power Factor Correction) to prevent this and maintain the lifespan of your transformer. As the previous comments have made note to, you're probably better off building a Tesla coil out of your NSTs that are under 20KV and, preferably, over 10KV. If you have any with 60mA ratings, that would be better, as you double your power consumption right there.
Oct 10, 2008. 7:49 PMtechnodude92 says:
that has it's limits though. you can't pump 10kv into a neon sign transformer primary and expect it to survive for long. You're probably better off building a tesla coil
Oct 12, 2008. 2:25 AMDerin says:
TESLA-MARX COMBO FTW!
Oct 14, 2008. 3:49 PMcowboy4884 says:
Right now I'm currently using a Peter Dahl Plate Transformer, 21,000 volts at 2.6 amps and its arcing about 18 inches. I built a tesla coil years ago when in school but it only arced about 12 inches and the arc wasnt very impressive. I just recently went to a swapmeet and picked up another plate transformer that put out 50,000 volts at 10 amps. The main reason I grabbed it was that the laminates can be disassembled and either the primary core or the secondary core can be removed. The secondary was wound with about 6 gauge wire, the wire is a flat stock type thats 1/8" X 3/8" and I figure that theres about 125' of wire wound on the core and I have about 1000' of 14 gauge wire on hand that I could rewind the secondary with. I could also play with the primary windings and adjust it to boost the secondary voltage. Theres plenty of room to work with. I figure that when I rewind the secondary I'll only be using about half of the usable space.
Oct 7, 2008. 2:27 AMmaxhumphries says:
anyone have any idea if you can make this portable, i'm a propsman by trade and a battery version would be very useful...
Mar 7, 2009. 8:04 PMmaccag115 says:
you can buy a $40 jacobs ladder kit from jaycar in australia, im guessing this would be like radio shack in usa, it uses a vn commodore ignition coil and a 12 volt battery
Jun 12, 2009. 7:44 AMcybergod says:
Hmmm, looks like a trip to Jaycar.... YAY ! Was looking at another place, but Jaycar are local. Hope they have it in stock. Many thanks for the heads-up. My 11 year old son and I will have fun making this one.
Mar 8, 2009. 12:03 AMmaxhumphries says:
Thank you Maccag, you've just allowed me to start up a very interesting project. thanks for all the other comments too, very helpful...
Feb 12, 2009. 4:15 PMtitle1pro says:
are you crazy do you know how much power that takes.
Jun 25, 2009. 7:01 AMchriskarr says:
I hope he does. Do you realize that your microwave oven, when on, consumes about 1KW? It has a transformer in it that is about 2.2KV at 500 to 1000mA (1A). This transformer is only 12KV at 30mA. 12000*0.03 = 360W. Much less than a microwave oven, so I really have no problem with running this in my house continuously, as long as I was able to have a firm foundation and a method of making sure the arc doesn't heat the rails too much.

I seriously doubt that the author is crazy.
Nov 20, 2008. 6:55 PMhuevon1b says:
I did this once with a couple of bicycle spokes connected to the transformer. They worked perfectly.
Jul 14, 2008. 11:13 PMDerin says:
is that a europe plug?
Aug 8, 2008. 6:01 AMthermoelectric says:
and australia plug
Oct 11, 2008. 6:39 PMthermoelectric says:
Australia plug!!
Oct 12, 2008. 2:21 AMDerin says:
dmn
Oct 12, 2008. 2:41 AMthermoelectric says:
Hehe
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