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Old 19th March 2006, 04:05 PM   #1
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Question USB charger problems

Hi,

It's been quite some time since I've visited this site, since I kind of lost temporary interest in my electronics projects (some of which still aren't finished after 4 years, but oh, well, they'll get finished eventually).

There's one circuit however, that I'd really like to work, and well, it isn't working...

It's simple enough: two 5 volt outputs on 1 PCB (2 regulators), each one going to a USB connector. Both have a LED indicating if more than 100mA is being drawn from the output. I'd use this to load my iPod when there isn't a PC available (or load 2 at the same time, like I tried on the last skiing vacation). Sounds simple enough, right?

Well, first of all, here's the circuit with some more explanation: http://members.lycos.nl/anthonyvh/in...ge=usb-charge.

This is what it's (not) doing: when tested with a modified USB cable, the circuit will deliver 280mA without a problem and the LED burns (haven't tested with higher values). The output is roughly 5V (a bit less because of the shunt resistor necessary to control the LED). However, when I plug in my iPod, the LED lights up for about 1/10th of a second and then it goes out. Nothing happens, no loading animations on my iPod, nothing.

Has anyone got any idea why this is? The iPod's working just fine, I can load it from my PC with both USB & FireWire, so well, I just don't get how this won't work.

Regards, Anthony
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Old 24th March 2006, 06:00 AM   #2
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Link dead.... post another one and we mite be able to assist you.
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Old 24th March 2006, 09:00 AM   #3
flo is offline flo  Switzerland
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Hi Devil_H@ck,

According to this site:

http://www.i-hacked.com/content/view/111/94/

you have to pull the data pins to ground, at least for
the iPod shuffle.

Florian
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Old 24th March 2006, 09:55 AM   #4
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Ah, yes, the link appears to be dead because the forum put the dot at the end of the sentence into it, here's a functioning link: http://members.lycos.nl/anthonyvh/i...age=usb-charge.

@flo: Thanks a lot, I had been looking for things like that, but couldn't find anything. I'll try it and let you guys know how it worked out.
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Old 12th April 2006, 04:46 PM   #5
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Took me a while to get to try it, but grounding the data lines works! Thanks a lot!
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