Help Needed for a Power supply project!!!!!

i dunno if ur aiming to build it urself, but if you want to purchase something, just go get a wallwart switchable power supply. its basically one of those big transformer plugs that you put into the wall, but you can switch the voltage output. i found mine @ wallmart. it has 1.5, 3, 4.5, 6, 9, 12 volts.

What's your input Voltage? How much current are you going to need/want?