On Sun, Nov 23, 2008 at 3:55 PM, PicDude wrote: > I also recently heard that most hubs don't actually control/limit the amount > of current to each port, but just add up the requests to know what's > available. But I'm not sure if any of the devices being charged check for > an acknowledgement from the hub before putting itself into charge mode. Or > perhaps some device might slow or fast charge based on an acknowledgement? > > But how about just putting a few USB jacks on a PCB and wiring that to a > regulated 5V wall-wart? I'm not really sure how the hubs are working...I just know that on the couple I had laying around, if I plugged the device in without the hub being connected to the computer it won't enter a charge mode. But using the same cable I can get the thing to charge using a 120V -> USB power adapter. I haven't had a chance to meter anything so I'm just assuming that they aren't allowing enough voltage through. To be honest, my initial idea was to do exactly as you suggest, some USB jacks on a PCB. Then I realized I can buy a hub for about $10 including the power supply. I don't think I'd be able to make something for that kind of money, let alone a nice enclosure! Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist