I made a basic singing arc, based on this Instructable. It uses a TL494 to switch a MOSFET very rapidly, dumping current into the primary coil of a TV flyback. The air rapidly heats up when the spark …

I got my first home computer for Christmas, 1982 (about a month before my 8th birthday). It was a TI 99/4A with a speech synthesizer, built-in BASIC interpreter, and audio tape storage device. I …