Simplified ES generator with added capacitors and flash light (measured breakdown ~ 6.5 kV). Common 9V battery to power motor and turn the disc. The disc can also be turned by hand and the charge builds up very quickly. Video: http://youtu.be/yXYd1l08RsY The video was done a second time because in the first try there was to much background light for the camera to capture the sparks. It's better now but still missing a lot - listen to the sound. Designed and built within two days (weekend) and to be seen as a draft version, this little machine produces a lot of current @ high voltage - always be careful!  The blue wires are contacting the disc. Either thin lize wire or carbon fibre (better), the green wires end in close proximity to the disc and do not touch. Connection: blue/top/left - connected to aluminium plate directly behind blue/bottom/left - connects to blue/top/right blue/bottom/right - connected to aluminium plate directly behind green wires are output - connected with capacitor legs, parallel is the flash light or spark gap (discharges bad for your ears) What learned - slower is better. Hyperspeed as shown in the video is nonsense. A lot of loses through fine blue mesh all over the segments (seen in the dark). Next machine might be smaller - or not depends if this discharges can be reduced somehow.