( http://www.instructables.com/ex/i/C2303A881DE510299AD7001143E7E506/ )
"????-- a project that uses another project as a stepping stone for further refinement, improvement, or application to a totally different problem. The community of DIYers that we're all a part of can really do some amazing things working together as a community. Innovation rarely happens in a vacuum. The obvious next step is to let the community help refine and evolve ideas that aren't yet ready to be finished projects."
We submit this now so that other iPod enthusiasts could pickup where we left off.
There are (at least) two reasons this charger _does not_ work:
1. The transistor doesn't let enough current flow to fully charge the inductor. The other option is a FET, but a FET needs a minimum of 5 volts to switch fully on. This is discussed in the SMPS section.
2. The inductor is simply not big enough. The charger doesn't produce nearly enough current for the iPod. We didn't have an accurate way to measure the iPod charging current (save cutting apart the origional charging cable) until our parts arrived from Mouser. The inductors recommended are nowhere near large enough for this project. A suitable substitution might be the coil Nick de Smith uses on his MAX1771 SMPS. Its a 2 or 3 amp coil from digikey:
( http://www.desmith.net/NMdS/Electronics/NixiePSU.html#bom )
This device can provide a small amount of power to a USB or firewire device, but not enough to charge an (3G) iPod. It WILL power, but not charge, a totally dead 3G iPod.