02-08-2002, 08:14 AM
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Executive Editor
Join Date: Aug 2006
Posts: 29,160
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Compaq iPAQ USB Cradle Charger Modification
http://ecece.com/info/ipaqcradlemod/ipaqcradlemod.html
By popular request, here's the very cool iPAQ cradle mod by Charlie Reverte.
"Have you ever wondered why your stock iPAQ cradle doesn't charge your iPAQ using power from the USB port like every other aftermarket sync cable? Here's how you can modify (rice up) your cradle to do just that so you can use your AC adapter at work."
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02-08-2002, 08:28 AM
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Pupil
Join Date: Feb 2002
Posts: 15
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"Beat your kids"?
The guy who wrote this has poor taste when it comes to humor... :cry:
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02-08-2002, 10:20 AM
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Ponderer
Join Date: Feb 2002
Posts: 73
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Jason or anyone know how do this same mod on a 3800 cradle. I couldn't find any specs on the cradle to give it a try. The connectors are totally different. So anyone, anyone...
RC
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02-08-2002, 02:01 PM
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Thinker
Join Date: Feb 2002
Posts: 332
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I've done this mod on my H3660 cradle, it's a bit different, but it works. Very cool mod!
Daniel
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02-08-2002, 02:06 PM
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Oracle
Join Date: Mar 2005
Posts: 980
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Basically, All you need is a voltimeter and check that you are getting 5 volts from your USB Cable, the red cable is positive. Then if you jump the red cable from the USB with the Red cable from your power plug you are all set. Check the picture a posted at my site showing both ways.
How to
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02-08-2002, 02:51 PM
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Pupil
Join Date: Feb 2002
Posts: 12
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Thanks Jason! I am glad you were still able to find the article. I think I may try this soon, I will let everyone know how it went. :wink:
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02-08-2002, 03:00 PM
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Intellectual
Join Date: Jul 2003
Posts: 155
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This is a nice option, but I hope you read the warning on his page:
"I think the reason Compaq made this cradle work off of AC power and not off of USB power is so you could have wall power when you want to upgrade your OS. If you don't have an extra sync cable or a friend with a virgin cradle and you need to sync while running on AC power, you might have to undo this modification or build in a switch to bypass it (very easy, email me if you need help)."
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02-08-2002, 03:08 PM
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Pupil
Join Date: May 2005
Posts: 33
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Hi, it's me charlie
ctitanic, a few people have suggested that, its a very good idea. It would make it much easier to implement since you didn't have to solder to that small pin. I was in such a mad rush to try it once I saw how to do the mod that I didn't consider the traces on the pc board that hook up the ac adapter power to the comm socket. I've only read of one guy messing it up, i bet this would have helped him. I was going to update the page last weekend but I didnt have time. I'll probably get to it this weekend.
are there any other hardware hacks you guys want to see? maybe I can try to work some of them out.
about the 3800 cradle, I don't have a 3800, so thats not going to happen unless I can figure out a way to get my hands on one for a weekend.
--charlie reverte
[email protected]
p.s. lighten up rene, all of my friends thought it was funny..
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02-08-2002, 03:15 PM
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Oracle
Join Date: Mar 2005
Posts: 980
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Peterwest,
That's not correct. Like I said before, you can take and jump the red cable from USB with the Red Cable of your power plug. During the installation what they will verify is the existence of power in the pin number one of the Cradle and you will have power in there. So do not worry about that point.
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02-08-2002, 05:40 PM
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Neophyte
Join Date: Feb 2002
Posts: 1
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Would it overcharge the battery without using power adapter?
As far as I know, lithium ion battery require circuit from the charger to give proper voltage info to the battery and keep charging it until voltage reach a certain point!
Wouldn't it do any damage to the battery if power just come from the USB?
Maxor
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Linear Mode
