Ok.  Thanks for the help, I understand it a little better now.  I'll probly have more questions soon.

Thanks again.

Ok.  I see your point.  For the sake of my continued education, if I were to find a 40v wall wart (yeah, it's ridiculous), it would make +/-20v DC right?  How would I wire it to the circuit?  In my limited experience, a tranny has 3 wires while a wall wart just gives you + and - right?  If we consider the schem -



Where would Vee and Vcc come from if one was using a wall wart vs. a tranny? 

I really appreciate your patience; I can't seem to get my head around this power supply stuff.

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?