This circuit uses a tesla coil to generate extremely high voltages. I've made this with a 140mm high and 70mm diameter with 0.15mm wire tesla coil, and at 80 volts it makes 6centimeters sparks. Then i plugged my cellphone with an opamp and a very low reference voltage and the sparks now are playing music! I think i'll make a video on youtube for this awesome thing!
-nikisalli
