Which iPod? - Saab General Bulletin Board - Saabnet.com


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Which iPod?
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Posted by Ari [Email] (more from Ari) on Tue, 30 Dec 2008 15:46:39 Share Post by Email
In Reply to: Is Granite Embedded Systems a complete waste?, Bob M, Tue, 30 Dec 2008 06:39:05
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Apple changed the way the newer iPods charge. Specifically the 2nd generation iPod Touch, the 3g iPhone, and I think the newer Nano. Older units used a Firewire charging; newer ones are USB only.

If that were all, it would be simple. But Apple threw in another curve. A USB connection has four contacts - 5 volts and ground on the outside pins, and two signal wires on the inside pins. The 2g Touch and 3g iPhone (and maybe the new Nano, I don't know) need to see a signal on the signal pins. The audio uses a different set of wires. With the old chargers, they just put 5 volts and ground on the outside pins, and left the inside ones floating. Stick a 2G Touch into an old charger, and it won't charge. This has caused a lot of headaches with folks discovering their old chargers, speaker systems, etc., won't charge their new toy. Many systems on the market today haven't been updated to work with the new iPod charging requirements.

So depending on your iPod model, the GES might be perfectly OK. However, if you've got an older iPod (probably a year old or older), the GES has some 'splain' to do.

If you do have a newer iPod, and you're handy with a soldering iron, you can make an existing dock work. All it takes is to solder in four resistors - two 200K ohm in series from the + to - (outside pins on a USB connector), and two more 200K from that junction to the two signal pins. The resistance value is not critical - 100K to 300K will work just fine. If you've got an integrated dock, it would mean opening it up and getting to the right pins on the tiny dock connector.

I've done this for simple charging only docks.




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