Makes a TV into an oscilloscope like thing,
By various authors
http://web.archive.org/web/20010728154945/http://users.ev1.net/~bantha/bending/wobble.html
more circuit info: http://www.electro-music.com/forum/viewtopic.php?t=7010
almost incoherent description of some kind of tv mod: http://www.fly.net/~rupertg/onomatograph.htm