UCVC

[resonanceman]

I am just working with the circuit now to drive a car coil.  I need to play with the components in orfer to get a good spark at the car coil output.

Jesus

Jesus

I am not sure what  you need sparks for.

Are you trying to make the coil yourself or just get some sparks?.

If you want a quick and dirty way to make a STRONG high voltage JT a MOT will do the trick.     ( Mictrowave Oven Transformer )

Back in the days when I was trying to make a JT with anything that had wires coming out of it I scared myself 2 times.
Once was when I made a JT out of a MOT.  I fried a 60 LED array a DMM and melted the insulation on  some alligator clips.
The other time was when I tried using an ignition coil  for a secondary on  a JT made from a flyback transformer core.
No real damage this time except alot of smoke and melted insulation from a couple  of my alligator clips.

If  you used an ignition coil as a secondary for a MOT JT I am pretty sure you would have a very good chance of scaring yourself before  you make some really nice sparks



Just be careful. 
I am sure that  you know that this kind of voltage can be lethal

gary



Edit

Just in case not everyone understands  how to use an ignition coil as a secondary ..... just connect one wire of your JT secondary to each of the  low voltage posts of the ignition coil
The center post becomes the HV secondary ....... I do not remember exactly what I connected the other end to ......but I am pretty sure almost anything would do.
Now .......I think I would look for a HV cap in the .1uF range and use it to buffer the HV a little then connect that to a HV bridge.......then feed it back to source.
If the voltage drops to low when  you connect the cap....... try a smaller cap.

The cap will buffer the impulses just a little and act as a current limiter for  your feedback.

gary

[nievesoliveras]

I will try to build a coil using a formula.
The formula is:

1. Divide the desired voltage by the voltage you have as source
2. The result is the step up number.
3. Chose a safe number of wire turns as a primary winding
4. Multiply it with the step up number (it gives the secondary turns number)

The circuit driver must be good. I have damaged a lot of parts with the heat produced on the parts.

Jesus