Tesla coil was proposed by an inventor Nicholas Tesla in around 1891 and known as resonant transformer or Tesla transformer (TT). Tesla transformer can produce high AC voltages at high frequency and low currents. This paper describes design and operation homemade tesla coil. Different tests were done to find the optimum conditions of operating Tesla coil such as maximum output voltage, current and spark length. Fast Fourier transformer (FFT) of primary and secondary side signals was done.