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#1
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USB Hub as an iPod/iPhone Charger
This person just shorted Data+ and Data- pin! Didn't use any resistor at
all. Comments? http://carlhutzler.com/blog/2009/07/...phone-charger/ -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.5 ^ ^ 16:50:02 up 2:05 0 users load average: 1.16 1.21 1.25 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_...sub_addressesa |
#2
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USB Hub as an iPod/iPhone Charger
Man-wai Chang wrote:
This person just shorted Data+ and Data- pin! Didn't use any resistor at all. Comments? http://carlhutzler.com/blog/2009/07/...phone-charger/ Well, download the 500 page USB2 spec, analyse it, and see what the consequences would be ? :-) I think the various "weak resistor" circuits you've been looking at, are safer. All the hacks require soldering, so you might as well solder resistors to your charging connector. I think your three resistor circuit (giving 2.5V on one lead and 2.0V on the other) has some merit, and might be your best option. By using high resistance values, as those circuits have been using, there is virtually no chance of damage. I can't tell you, right off hand, how the USB I/O pad would respond to a short circuit from D+ to D-. I don't know what that would do, if the USB I/O pad decided to drive the signals for any reason. (Like trying to drive out a chirp.) (Picture of chirp sequence on page 15) http://ep-div-ed.web.cern.ch/ep-div-.../Mikes_USB.pdf Paul |
#3
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USB Hub as an iPod/iPhone Charger
of damage. I can't tell you, right off hand, how the USB I/O pad
would respond to a short circuit from D+ to D-. I don't know what that would do, if the USB I/O pad decided to drive the signals for any reason. (Like trying to drive out a chirp.) OK, I took the plunge and mod a malfunctioning USB hub. The iPod Touch 3 powered up itself when I plugged in the iPod cable, BUT there was NO CHARGING!! DAM! -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.5 ^ ^ 18:20:01 up 3:35 0 users load average: 1.23 1.30 1.31 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_...sub_addressesa |
#4
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USB Hub as an iPod/iPhone Charger
Man-wai Chang wrote:
of damage. I can't tell you, right off hand, how the USB I/O pad would respond to a short circuit from D+ to D-. I don't know what that would do, if the USB I/O pad decided to drive the signals for any reason. (Like trying to drive out a chirp.) OK, I took the plunge and mod a malfunctioning USB hub. The iPod Touch 3 powered up itself when I plugged in the iPod cable, BUT there was NO CHARGING!! DAM! Did you use the three resistor circuit ? Have you verified you connected it up so that the D+ and D- got the voltages others have used ? Paul |
#5
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USB Hub as an iPod/iPhone Charger
OK, I took the plunge and mod a malfunctioning USB hub. The iPod Touch
3 powered up itself when I plugged in the iPod cable, BUT there was NO CHARGING!! Did you use the three resistor circuit ? Have you verified you connected it up so that the D+ and D- got the voltages others have used ? I just shorted D+ and D- directly, not using any voltage divider. BTW, this afternoon, I tried to salvage a few 10K resistor from the dead power supply and burnt my finger tip with the soldering iron. -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.5 ^ ^ 18:30:02 up 3:45 0 users load average: 1.39 1.33 1.33 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_...sub_addressesa |
#6
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USB Hub as an iPod/iPhone Charger
Man-wai Chang wrote:
OK, I took the plunge and mod a malfunctioning USB hub. The iPod Touch 3 powered up itself when I plugged in the iPod cable, BUT there was NO CHARGING!! Did you use the three resistor circuit ? Have you verified you connected it up so that the D+ and D- got the voltages others have used ? I just shorted D+ and D- directly, not using any voltage divider. BTW, this afternoon, I tried to salvage a few 10K resistor from the dead power supply and burnt my finger tip with the soldering iron. To salvage components, you need: 1) Solder wick. This draws up the excess solder. When done properly, there will be very little holding the component in place. Note that solder wick comes in different thicknesses, and retailers like this one will sell the "fat useless" type. You have to search around to find a roll of "fine" wick. http://www.thesource.ca/estore/produ...duct =6402090 In the example here, 0.030" wide or 0.050" wide are available. I may have even had some 0.025" in the tool box at one time. http://www.chemtronics.com/literatur...rochure_LR.pdf http://parts.digikey.com/uk/1/121774...5-50-1-25.html The thin solder wick is easier to heat with the soldering iron. If the wick contains "resin", that helps promote the flow of molten solder into the wick. The dry wick they sometimes sell for usage on ROHS assemblies, is kinda useless. At least, the wick I've bought in the last few years, hasn't worked very well for me. Only the older stuff I've got, works good. 2) Hobby knife blade, to use to move a component when it is hot. The nice thing about the knife blade, is if you burned it, you can get more blades for the knife, cheaply. 3) Pair of needle nose pliers, to hold a component or to provide a heatsink, to prevent heat from going places where it will melt the plastic. If you place a flat elastic band around the handles, the pliers can be made to grip an item. http://www.active123.com/_static/web...012_none_3.jpg When you own enough tools, there is hardly ever a reason to stick your fingers in there :-) http://www.micromark.com/RS/SR/Product/84454_R.jpg Paul |
#7
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USB Hub as an iPod/iPhone Charger
When you own enough tools, there is hardly ever a reason to
stick your fingers in there :-) http://www.micromark.com/RS/SR/Product/84454_R.jpg The board in the dead power supply is a lot larger. -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.5 ^ ^ 20:05:01 up 5:20 0 users load average: 1.02 1.07 1.11 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_...sub_addressesa |
#8
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USB Hub as an iPod/iPhone Charger
Man-wai Chang wrote:
When you own enough tools, there is hardly ever a reason to stick your fingers in there :-) http://www.micromark.com/RS/SR/Product/84454_R.jpg The board in the dead power supply is a lot larger. I still think the mixed pack of resistors is your best bet. You can likely find three resistors close enough in value, to do your charger project. http://www.thesource.ca/estore/produ...duct=27190 18 The only time I salvage resistors, is when they're the big ones. Even at work, when we needed to build a dummy load, one of the guys walked down the street to a surplus electronics place and bought some used power resistors. That was a lot cheaper, than trying to buy them brand new. But for the tiny $0.05 resistors, it's better to just buy a pack and put them in bins. https://getzequipment.com/oscommerce...Drawer-WS1.jpg For my parts cabinet, I only sort them to the nearest decade. So 100-999 ohms goes in one drawer, 1000-9999 ohms goes in the next drawer, and so on. It means having to sort through them, but isn't quite as bad as having them all jumbled together. If you put each resistor value in its own drawer, the storage requirement would be huge. Paul |
#9
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USB Hub as an iPod/iPhone Charger
I still think the mixed pack of resistors is your best bet.
You can likely find three resistors close enough in value, to do your charger project. There is no such deal in Hong Kong. Haven't seen any shop offering it. If you put each resistor value in its own drawer, the storage requirement would be huge. They are just a few Hong Kong cents a piece. I can afford that. -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.5 ^ ^ 21:00:02 up 6:15 0 users load average: 1.01 1.05 1.11 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_...sub_addressesa |
#10
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USB Hub as an iPod/iPhone Charger
Did you use the three resistor circuit ? Have you verified
you connected it up so that the D+ and D- got the voltages others have used ? After reading the documents you posted here, I learnt that no current would be released unless D+ is 2.5V and D- is 2.0V. So, I guess I have to do the voltage divider circuit after all. -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.5 ^ ^ 21:05:02 up 6:20 0 users load average: 1.08 1.07 1.10 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_...sub_addressesa |
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