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Modifying a USB cable to charge iPod without PC connection

M

Man-wai Chang

http://www.gizmodo.com.au/2008/07/simple_hack_turns_usb_charger_units_into_iphone_chargers-2/


+5V ---50k --- D-
|
10k
|
GND ---40K --- D+

Is this safe? Would it work?

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
^ ^ 22:00:02 up 5 days 2:01 1 user load average: 1.10 1.08 1.05
ä¸å€Ÿè²¸! ä¸è©é¨™! ä¸æ´äº¤! ä¸æ‰“交! ä¸æ‰“劫! ä¸è‡ªæ®º! è«‹è€ƒæ…®ç¶œæ´ (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
 
M

Man-wai Chang

+5V ---50k --- D-
Show your work -- why make people duplicate your analysis?

I dont' wanna kill my iPod Touch... :)

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
^ ^ 23:40:01 up 5 days 3:41 1 user load average: 1.00 1.04 1.05
ä¸å€Ÿè²¸! ä¸è©é¨™! ä¸æ´äº¤! ä¸æ‰“交! ä¸æ‰“劫! ä¸è‡ªæ®º! è«‹è€ƒæ…®ç¶œæ´ (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
 
M

Man-wai Chang

At initial glance it seems good, but I haven't read the whole USB

Too much information.... -_-"

Are you saying that the voltage over D+ and D- should be smaller than
2.0V and 2.5V respectively?

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
^ ^ 18:57:01 up 5 days 22:58 1 user load average: 1.01 1.06 1.05
ä¸å€Ÿè²¸! ä¸è©é¨™! ä¸æ´äº¤! ä¸æ‰“交! ä¸æ‰“劫! ä¸è‡ªæ®º! è«‹è€ƒæ…®ç¶œæ´ (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
 
J

Jasen Betts

Too much information.... -_-"

Are you saying that the voltage over D+ and D- should be smaller than
2.0V and 2.5V respectively?

The only maximum voltage number I saw quoted for those pins was 3.6V
I skimmed it, mostly I did searches and looked at the diagrams.
 
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