hey i was wonderting if it would b possible to put a 9V DC into this pedal (http://smallbearelec.com/Projects/TweakO/TweakO.htm) instead of using a 9V battery?
you always can, in GGG (http://generalguitargadgets.com) are several examples of how to do it, try the blues breaker, it has some diagrams.
Yep, the DIY FAQ at the top has links to articles on how to do this.