This is one of the simplest and easiest circuit design, with just a few simple parts, you'll be creating your own mini tesla coil. Great deals on Tesla Coil. Let's make it! A Tesla coil is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891. Fast & Free shipping on many items! The circuit of the coil contains a capacitor and a small hole called a spark gap. Video of Tesla Coil 2 mk iii in action in early 2014, running ~4.2kVA at ~330bps making 1.8m sparks.. Latest Tesla Coil 2 mk iii Specifications (Jan 2014): . It can transfer wireless electrical power to the CFL in no time. Type - Asynchronous Rotary Spark Gap Tesla Coil Power - 8600VAC 4-stack MOT transformer Primary - 50 feet of 1/4" Copper Tubing, 1/2" spacing Secondary - 0.5mm enameled copper wire, 55cm on 4" PVC secondary Expand your options of fun home activities with the largest online selection at eBay.com. In this electronics project, we will make a simple Tesla coil circuit with a 2n2222 NPN transistor. The Tesla coil requires one more thing: a capacitor to store charge and fire it all in one huge spark. The coolest thing about this project is its simplicity.