Secondary winding of this spark gap tesla coil is 48 cm long, 7.2 cm diameter, wire 0.3 mm (tube is 55 centimeters long).
Primary has 4 turns of thick Coaxial.
Capacitor is a MMC type 40nF 22.5 kV. Here you can read more about it.
By shifting the tap, i can increase capacity up to 50nF.
Spark gap is static, in 4 copper tubes (10x120mm).
I power this tesla coil using three MOTs in the series. One of the Mots has not to be grounded - I used the MOT with a good plastic insulation.
Ballasting (current limiting) is made of further 2 to 3 MOTs on secondary side.
Sparks are 60cm long. Operation is very noisy, even though in the video it doesn't seem.
!!! WARNING !!! Tesla coil is an extremely dangerous device!
Its supply voltage is deadly!
Without knowledge of the principles of working with high voltage, you can not construct it.
Tesla coil causes a broadband radio frequency interference. Electromagnetic
radiation can damage electronic devices or storage media. The spark gap produces
ozone (O 3 ) and other toxic gases, they have to be ventilated!
Spark gap emits UV radiation. Current at ignition
discharge of up to several kiloampers. Capacitor can remain charged even after shutdown. The device is very noisy and can damage hearing. Everything you do at your own risk!
For any injury or damage I do not take any responsibility.
schematic of the spark gap tesla coil (SGTC) with MOTs