Step 6: The schematic
It will run on a 12-20V DC power supply (may also be a battery).
I'm using a 12V adapter which somehow gives me 17V output, and when connected it drops to 15V due to the internal resistance.
As you can see, we're using a side of the HV coill as feedback for the Gate on the MOSFET.
It will couse some kind of delay between each pulse which is sent to the primary coil.