Ball-Gap dischargerthe gap can be adjusted Use DC 12v-24v(1A) power Manufacturered by HandsMagic. Small but full functioninga real Mini SGTC .Can produce a beautiful arc like the pictureCan touch without worrying about injury The most important thing is that there are only 9 components on the entire board that need to be soldered. The tutorial is very detailed the drive is modular the DIY is very simple and the effect is amazing. Spark gap tesla coil (SGTC) DIY Kitsinclude all the partsneed Prepare a power supply yourself