I'm a diystompboxes regular who is trying to branch out.  I searched the forum but couldn't seem to find the answer to what seems like a fairly obvious question.  So, either it is so stupid no one bothered to ask it, or it has been answered and my searching skills suck.

Ok, so I wanna build an LM1875 based amp.  Will a 18v wallwart power it?  Is there a reason not to use wallwarts with chipamps?