http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/ Engadget Comments for http://www.engadget.com/media/feedlogo.gif http://www.engadget.com en-us Copyright 2008 Weblogs, Inc. The contents of this feed are available for non-commercial use only. Blogsmith http://www.blogsmith.com/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/Feb 27th 2007 3:03PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/Feb 27th 2007 3:13PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/
and with the AA batteries there, there are usb batteries now... Expensive but better then normal Ni-MH ones:
[http://www.usbcell.com/]]]>Feb 27th 2007 3:33PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/Feb 27th 2007 3:33PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/Feb 27th 2007 3:34PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/
http://www.energizer.com/energitogo/index_flash.html]]>Feb 27th 2007 3:56PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/Feb 27th 2007 4:05PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/Feb 27th 2007 4:08PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/Feb 27th 2007 4:13PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/Feb 27th 2007 4:13PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/Feb 27th 2007 4:45PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/
Okay, good. How do you transform DC again? Transformers only work with AC, since they rely on the changing magnetic field created by a changing electric current.

Voltage regulators tend to only be able to regulate down.

What you need to use is a DC-DC converter, and as soon as you start doing this, it effectively creates a transformer-like situation. But you'll get some power loss.]]>Feb 27th 2007 7:45PMhttp://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/http://www.engadget.com/2007/02/27/sonys-energy-link-usb-power-supply-recharger/
http://en.wikipedia.org/wiki/Boost_converter

Or you go always go the DIY route with a Minty Boost. I made one last weekend that works well.

http://www.instructables.com/id/EGBQJPLCB2EP287KTZ?ALLSTEPS]]>Feb 28th 2007 2:46PM