|Just finished building an AA-battery iPod
charger, by the excellent design of Ladyada's. I found I could fit
mine comfortably within the battery house of an IKEA christmas light
thingie. This holds 4 AA batteries, so it had plenty of space. The
female USB connector is from a USB->USB extension cable, |
Still, the importance of checking the USB wiring should be stressed in the instructable, if it's not already... This can kill your iPod - I must've been lucky!
Also, I notice on the (version 1) Eagle schematic, she's labelled C1 and C4 as 1uF, which should read 0.1uF.
Old version (please bear with the crummy soldering...)
Updated version v1.2. Note that the legs on the MAX756 can only be bent twice, before they break off! Still, it's possible to solder components to the stump, but it's a fragile joint (yes, LBI snapped in my case).
|June 12 2007|
|Version 1.2: It seems the newer generation iPods need the data lines to be tied to 3V (or GND, depending on the model, apparently). By adding some resistors, the circuit finally works! Also, there's the nifty LED, which (as I understand) lights up when the batteries need to be changed. Or does it light when the iPod is charging? Not sure. In my case, it turns on when the iPod charges, but maybe the batteries are just old? Recommend browsing through ladyada.net, especially the forum. Lots of great info there!|
|June 8 2007|
After I finished
building, I checked with the voltmeter that the 3V from the batteries
is in fact transformed into 5V. When I connect my iPod nano, the
battery icon changes to the "lightning icon," and the green background
(in the icon) blinks, which seems to indicate that it's charging.|
However, after a while, the icon goes back to normal battery, and when I unplug the iPod, I can't see that the battery level has increased at all... Granted, the AA batteries are not fresh out da box, but I expected the design to be quite energy efficient. Or do I always need spanking new batteries to charge? OR, obviously, there's something wrong with my build.