DIY iPod Touch 3 Charger


M

Man-wai Chang

Of the 3 solutions I attempted, they all gave me a yellow triangle and
reported "Charging not support on this accessory" when it's fully
charged. I found some messages about an "authentication chip" in
official chargers. Maybe that's related, or it could just be a protocol
thing.

Potential divider is the best solution.

--
@[email protected] Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.39
^ ^ 17:54:01 up 7 days 2:56 0 users load average: 1.11 1.12 1.07
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
 
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P

Paul

Man-wai Chang said:
Of the 3 solutions I attempted, they all gave me a yellow triangle and
reported "Charging not support on this accessory" when it's fully
charged. I found some messages about an "authentication chip" in
official chargers. Maybe that's related, or it could just be a protocol
thing.

Potential divider is the best solution.

Did you do it like this ?

R1 R2 R3
+5V --- resistor ---+--- resistor ---+--- resistor --- GND
| |
D+ D-

or did you use a four resistor circuit ?

If you did the three resistor circuit, what were the values of
R1, R2, R3 ? Just for the record...

An authentication chip seems a bit excessive. To prove it,
someone who owns the Apple adapter would have to open
it up and look for the chip, and get a number off it.

Paul
 
M

Man-wai Chang

Did you do it like this ?
R1 R2 R3
+5V --- resistor ---+--- resistor ---+--- resistor --- GND
| |
D+ D-
If you did the three resistor circuit, what were the values of
R1, R2, R3 ? Just for the record...

Yes. R1=10K, R2=40K, R3=50K
An authentication chip seems a bit excessive. To prove it,
someone who owns the Apple adapter would have to open
it up and look for the chip, and get a number off it.

I got a feeling that the iPod firmware was programmed to deny
"un-licensed" charger. All 3 solutions worked in the very beginning, but
then the iPod "learnt" that they were not Apple chargers, and displayed
the yellow triangle.

--
@[email protected] Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.39
^ ^ 14:47:01 up 7 days 23:49 0 users load average: 1.01 1.03 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 --- resistor ---+--- resistor ---+--- resistor --- GND
Yes. R1=10K, R2=40K, R3=50K

Oh no... wrong arrangement! Correcting it. Report back later.

--
@[email protected] Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.39
^ ^ 15:27:01 up 8 days 29 min 0 users load average: 1.14 1.07 1.06
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

R1 R2 R3
+5V --- resistor ---+--- resistor ---+--- resistor --- GND
| |
D+ D-
If you did the three resistor circuit, what were the values of
R1, R2, R3 ? Just for the record...

Corrected values: R1=50K, R2=10K, R3=40K.

So far so good. Hot-pluggin not working as usual.

--
@[email protected] Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.39
^ ^ 20:39:01 up 8 days 5:41 0 users load average: 1.00 1.02 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

The diagram should look like this:

R1 R2 R3
+5V --- resistor ---+--- resistor ---+--- resistor --- GND
| |
D- D+

Note that D- is between +5V & D+
Corrected values: R1=50K, R2=10K, R3=40K.
So far so good. Hot-pluggin not working as usual.


--
@[email protected] Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.39
^ ^ 21:09:01 up 8 days 6:11 0 users load average: 1.07 1.08 1.06
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
 
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M

Man-wai Chang

OK, same yellow triangle when the battery was fully charged.

--
@[email protected] Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.39
^ ^ 19:20:02 up 9 days 4:22 0 users load average: 1.01 1.03 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
 

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