|
Rockbox mail archiveSubject: RE: Archos Jukebox design flawRE: Archos Jukebox design flaw
From: Justin <jaf60_at_it.canterbury.ac.nz>
Date: Tue, 07 Jan 2003 17:08:40 -0800 >If your USB port strictly follows the spec, it is not possible to power a >standard HDD, as 500mA just doesnt cut it (these drives draw ~ 1A when >spinning up). >So, this is one case where the Archos engineers did the right thing .... Well, not really. At up to 500mA, USB delivers more power than many of the archos power adpators can, and you can run the Archos off the adaptors (the unit plays and charges simultaniously, and the batteries handle the powerspikes when they happen), so why not power it off the USB? With a few design changes, the unit could run off USB, I imagine it doesn't only because it's designwise, it's simpler to get an adaptor to provide you with an easy voltage for the job, than it is to take a less convenient and pre-determined voltage (USB 5V) and design your charging system with that in mind. As it happens, I seem to be plagued by unpowered USB hubs, so having the archos run and charge off USB probably wouldn't be a huge advantage for me, but I don't see that it shouldn't be done. In fact, I imagine I could build a USB cable that has a normal USB plug that the computer end, and terminates in a USB plug and a 9V DC plug, thus making it possible to run and charge the unit from USB. In fact, that cable almost sounds like a future Archos product... :-) Received on 2003-01-08 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |