Rockbox.org home
release
dev builds
extras
themes manual
wiki
device status forums
mailing lists
IRC bugs
patches
dev guide



Rockbox mail archive

Subject: RE: Archos Jukebox design flaw
From: Justin (jaf60_at_it.canterbury.ac.nz)
Date: 2003-01-08


From memory (of someone else's readings) it's about 230mA, hence people
using 300mA regulated adaptors without problem.
Also, since the Archos further reduces and regulates the input power
voltage internally, you might only need to convert the USB up to 8 or
8.5V, thus increasing the leeway (well, getting some breathing space
anyway :).
However, it sounded like at least one batch of US models were altered to
take the kings adaptor over-volting without damage, so apparently not
even 9V is enough to charge those ones properly.).
Mine runs ok at 7.5V but charges significantly slower than normal at
that voltage. I'd guess at 8V being as low as I'd want to run it.

Oh oh oh! I have a brand new AJBR20 sitting here that I'd forgotten
about.
(How did I forget about something like that, you ask? I bought it for a
friend, and it'll be a while until I deliver it)
I might test that one also...

-----Original Message-----
From: Joaquim Carvalho [mailto:jdc_at_x64.com]
Sent: Tuesday, January 07, 2003 6:10 PM
To: rockbox_at_cool.haxx.se
Subject: RE: Archos Jukebox design flaw

> 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.

A 5V 500mA supply means 250mA max. after conversion to 9V with a 90%
efficiency voltage doubler. Charging 1200mA batteries at 250mA would
take around 5 hours. Would that be OK?
What is the Archos operating current consumption? Is it below 250mA?



Page was last modified "Jan 10 2012" The Rockbox Crew
aaa