I have a limit of 24v, i need about 15kv, i can use a transformer but that requires a 120v input, could i jump 24v to 120v and then 120v to 15kv? or would that screw up the amps to much? and would there be a way to just jump from 24v to 15kv without the step between?
You should be able to build a transformer to get from 24VAC to 15000VAC. If you need either of those to be DC you will need additional components. Of course the output current will be less then 1/625th of the input current. Do you know how much current you need to get out of the power supply?
About everything is possible, but 15kV is not easy.
Do you need DC or AC ? How much current at the 15kV ?
When that 120V -> 15kV transformer is okay, you could try with 24V and find the oscillation frequency for that transformer. Some transformers have a peak that is 5 times higher than the normal 50Hz/60Hz. That peak frequency could be between 100Hz and 500kHz.
When you use two transformers, one transformer from 24V to 120V and one from 120V to 15kV, you will have a lot of loss. But in theory it will work.
However, any solution will be dangerous, and you have to know what you are doing. The 15kV is something serious.
You'll need proper equipment for 15kV isulation,this voltage level is the one I see on the street aerial wires (for residence consumers) and it can kill you.
What do you need 15kv for?
This low power 25 kV supply is cheap and runs on 12VDC. Reduce the number of diode multipliers for lower voltages (in steps of 2 kV).
http://www.amazing1.com/products/25kv-5ma-low-cost-high-voltage-power-supply-and-charger-assembled-kit-or-plans.html
I have one and it works well. It uses one of the 12V to 2 kV high frequency AC modules that can be found for about $6.00 on the surplus market.
Hi, do you need 15kV AC or DC and what will it be supplying current to?
Also how much current?
Tom.... 
You cannot run a transformer "backwards" that is take a 120/24 transformer and feed 120V to the 24V winding in order to get 600V. Running a winding at a too high voltage will saturate the iron core and the resulting current will destroy the transformer.
What you can do is take a transformer from a microwave oven. They have a secondary of about 1kV. If you need Dc connect a cascade rectifier. If you need AC get several transformers and series connect the secondarys (with the right phase)
But please be aware of that voltages over 1kV are extremely dangerous for several reasons.
- The voltage is high enough to ionize air and cause flashovers. That means you can get an electrical shock without actually touching any part
- The human bodys skin impedance is almost zero at those voltages leaving only the body's and the supply's inner impedance to limit the current. In most cases this will result in a lethal current
Now that a microwave transformer is mentioned, I guess we are not holding back for dangerous things.
So I might just as well show this link: http://tesladownunder.com/HVsupplies.htm
I would strongly recommend to abandon the project. High voltages are dangeraous unless you thoroughly understand what you are doing and your question shows that you are very far away from that.
Darwin had some comments on that
@Peter_n and @nilton61: On my free time I acutaly have messed around with the transformer from a microwave, and I've built an ark welder from it, but this project that I'm doing has to be much more professional then taking apart a microwave
@Henry_Best I am going to make a Jacobs ladder
@TomGeorge Since I'm making a Jacobs Ladder i could use either and I guess I want to use what ever would have a better result so I guess AC. Oh and I need like virtually no current, just enough to arc thats it, so as @johnwasser said ill have 1/625th of my original thats totally fine.
@Peter_n Could you go more in to finding the osculation frequency, explain that a bit more
Some transformers can peak at a certain frequency. It is almost never documented for that transformer and you have to test that yourself.
A Jacobs Ladder requires current. The arc contains a large amount of energy. When you hold a piece of paper in the arc it will catch fire instantly. I can still show you the burn marks on the wood of the attic where I used to live. You have been warned.
I used a transformer for Neon lights, powered by the mains. You need a strong driver to do that with 24V.
@Peter_n I realize this is dangerous and that a piece of paper will catch fire, I understand how they work and have a descent amount of background in EE, I was just wondering if I could use a 24v source of do i need a 110v? I think i found my answer and that I need 110v thats fine, its not preferable but it'll do.
If using DC, have you thought about ignition coils.
Hi, try SiliconChip magazine ,
http://www.siliconchip.com.au/videos/jacobsladder
They use a late model ignition coil, as suggested by bluejets.
Tom....