I found a way to use a switch mode powersuply from an old computer i had laying araund as a spair. It is very easy to build and gives you 1-4 cm arcs with an input of abaut 4A.
Step 1: Warning!
This driver may under the right sercamstanses blow a fuse or eaven kill you.
DO NOT UNDER ANY SERCOMSATANSES TOCH THE HIGH VOLTAG OUT OF THE FLYBACK OR THE OUTPUT OF THE POWERSUPLY!!!!!!!!!!!!!!!!
Damag that can hapen to the SMPS can be seen below.
P.S. dont use a powersuply that is over 200W else it can explode.
i will make a new instructable soon, on a new and inprovd method. that will not self distrukt, if there are any mistakes.
Step 2: Step 1:
Open The powersuply.
Just disconet the suply from mains power, disconet from computer.
Step 3: Step 2 Conections:
Solder 2 wires on the the thransformer:
12HFAC and graund, usualy in the midel.
Do not huck the wires to the primary but hook them to the 12V secondary.
to identafy the sec just follow the wires on the bord.
Step 4: Step 3:
(do not use)
Hook up a bufer capaciter betwean the two wires from the transformer.
i used a 22nF 250VAC capaciter
do not use a Elko!!! they will explode
the capaciter triks the powersuply into thinking that ther was a user hooked up to it and prevents a high voltag feedback from the flyback into the powersuply.
use an induktor from another smps and hook the capacitor mentchnad befor in paralel with the induktors coil. i coil shold give u 4-6A. this methed produces a lot of heat, thats why you sholdent use this more then 2-3 min.
Step 5: Step 4:
wind aproxamently 6 turns on the flyback core, this will be hooked up to the powersuply.
use a hotstik to test the polerity of the flyback, big arc right polerity schort arc wrong polerity or just use a batery and a multimeater and look for the polerity.