Judging from the video (found after the break) the Nebulophone is one of the best sounding DIY synthesizers we’ve seen. Especially when you consider the simplicity of the hardware design. It uses an AVR chip and an OpAmp. The rest of the parts are just a few handfuls of inexpensive components.
The material for the body coil was chosen foamed sheet pvc plastik 3mm thickness. Easy material pliant white which sold in stores that sell materials for advertising makers, simply cuted with paper knife and glued . Since it was glued in a sandwich thickness 9mm machine had to mill body of coil.