View Full Version : USB Power injector IMPROVED
01-28-2006, 07:39 PM
Tons of pictures and a howto:
Yay! It's not the best one out there (Simon's is awesome (http://www.internettablettalk.com/forums/showpost.php?p=6790&postcount=16)) but the components are EASY to find and it took under two hours from start to finish.
Next step: Add a switch and a power LED. The LED will probably just be patched right against the regulator and the yellow power lead was left so long to allow for the switch.
01-28-2006, 10:38 PM
Thanks for the Monty Python moment: "Oh, look at the penguin!"
More great work!
01-28-2006, 11:54 PM
Thanks Mr. Cane.
I added to it and updated the post: A switch and an LED.
01-29-2006, 05:00 AM
Hey thoughtfix, looks good! You made me remember I had to update my page. No circuit diagram yet sorry. Been busy (been rebuilding an old sports car the last 2 years and I REALLY want to get the engine running before a friend visits from the states in a week). But I did put up a link to the low voltage circuit I used in mine and a link to some data for the LM2940CT-5 low voltage regulator I used. It is pin compatible with the 7805 you used so since you have your brilliant no solder connection method you can easily change it over. Page is here: http://www.asciimation.co.nz/770/
Just wish I could get that folding keyboard to work :(
01-29-2006, 04:50 PM
How did you get it to blink when the voltage was low? Also - do you know if the regulator will operate at 7.2V input? If I put in six 1.2V 2200 mAh rechargable batteries, I could have something that's good for long-time road use.
Also - I am going to convert my old patch cable to work on the 12V - 14.4V in the car in case I want to do some extensive GPS/mapping stuff that requires external storage.
01-29-2006, 08:14 PM
*tapping my feet, waiting to be able to buy something like these...*
01-30-2006, 02:46 PM
Hey... who'd be interested in a car charger that also provided power to USB devices? I could build one of those too.
01-30-2006, 04:31 PM
If you look on my page there is a link to the circuit I used for the blinking low power warning. That regulator I used would be fine with those batteries of yours. I think it is good for up to 26 volt imput.
My box is dead again. The AAA cells I used are, well, total crap. Two of them have died again. Need to get some better batteries.
06-12-2006, 05:20 PM
this could be an interesting addition http://www.apc.com/resource/include/techspec_index.cfm?base_sku=UPB10&tab=models
06-12-2006, 08:21 PM
As a warning to anyone who frequently travels, and is interested in building a USB power injector. These devices do NOT pass through airport security easily. Aparently mint tins with wires connected is frowned upon at screening areas. I gave up traveling with mine, and ended up modifying a USB hub.
06-12-2006, 09:13 PM
with the APC device, you could use one of the travel USB hubs with the split power connector, connect data/power to the 770 and strait powert to the APC. "hack" done, and with no custom parts, soldering, duct tape, or waranrtee voiding.
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