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/index.php?page=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
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/index.php?page=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
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
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
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.
@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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