iPods are all basicly the same, they can be made with fewer parts then what they show you in schematic. You need a 5V regulator, 2 NPN transistors (something like a 3904) and 2 pots. the whiper of the pot should be connected to the base of the transistors, the other 2 terminals can be connected to ground, and the output from the 5V reg. you need to adjust the pots so that the output of the transistors are 2.75V and 2V. i'm not sure of the order off of the top of my head, but i assume that (pin1=5V, pin4=ground) the order is 5V, 2.75V, 2V, ground. I know for a fact that if you strip back a USB cable then the red wire is 5V, the white wire is 2.75V, the green wire is 2V and the black wire is ground. if you don't want to use a USB cable then just try flipping pin 2 and pin 3's values, worst thing that happens is your iPod won't charge (not permenently). When i make these circuits, i allow a 5% tolerence on the output. But everyone else is right, you can't do much charging with a 9V battery, maybe 1 charge if you are lucky. but, using 6 AAA batteries will definitly give you a few more charges. bigger size batteries and more cells will increase the number of charges.