One of my favorite projects is of course the high voltage one, flyback transformer driver. Flyback transformers are commonly used in CRT TVs. Info from wikipedia: A flyback or line output transformer (FBT or LOPT) is a type of transformer used in the power supply of a cathode ray tube that generates the high voltage needed as part of the supply of a CRT display or for other devices such as plasma globes. It generates a voltage ranging from a few kilovolts for an oscilloscope tube to 20 to 50 kilovolts for a color TV tube. Unlike a mains transformer which uses an alternating current of 50 or 60 hertz, a flyback transformer operates with switched currents at much higher frequencies, usually in the range of 17 kHz to 50 kHz. More... Its easy to find one, but what can you do with it? I decided to put togheter few interesting ideas to show you, but I must warn you, its dangerous! Please make sure you know what you're doing and if you dont have any experience with high voltage then don't even try to make one! The first thing you will need is flyback transformer it self, you can find it in any CRT TV, old ones are always better and easier to work with. The hardest part is the driver, there is a few different ways to make it, the easiest one is "3055" circuit but its not as good as 555/MOSFET flyback driver. 555/MOSFET flyback driver is simple and can be used for different transformers, the main part in this driver is 555 timer IC which can generate PWM signals at high frequencies. Flyback transformer usually work best at around 15kHz and 90% duty cycle. The second main part in 555/MOSFET driver is MOSFET Power Transistor. The common one is IRF840 since it's cheap and easy to find, you might find one in the same CRT TV you got your flyback transformer from. The Circuit Image from www.electronics-lab.com

After days of internet research and trys after trys I found this circuit at http://www.electronics-lab.com/projects/misc/016/index.html and finally built my very own Flyback Transformer Driver using 555 Timer IC and MOSFET Power Transistor! Now, what can you do with 20,000 volts? I tried few interesting things with 20,000 volts and I seem to never get tierd of it, it's that fun! Here I will list some of the popular and interesting projects you can do with this 20,000 volts flyback transformer. 1. Biefeld Brown Effect More Info 2. Plasma Speaker More Info