I built this audio amplifier for my circuits lab course. In the lab I had access to a benchtop power supply for the necessary +- 15V. Now I'd like to give the completed amp and speaker to a friend as a Christmas gift, but I need some way of powering it without the power supplies we had in school.
I intend to build it inside a tin lunchbox and I'm considering just using the necessary batteries. However, I'd also like to know if there is a simple way to get the +- 15V I need through a standard 120V wall outlet.