From: David Reis <dlr_at_cbord.com>
Date: Tue, 6 May 2003 09:31:17 -0400

Necessity is the mother of invention. Great work and thanks again for all
the information.


Bubba

-----Original Message-----
From: Dave Jones [mailto:dave_at_hfpacoustical.com]
Sent: Monday, May 05, 2003 11:19 AM
To: rockbox_at_cool.haxx.se
Subject: RE: Long recording


Well, after some experimentation trying to power the Archos from an
external battery pack (12V) through a DC-DC convertor to the DC input (9V
nominal) on the Archos, I realized this was just not a very good setup.

The combination of the voltage headroom required of the DC-DC convertor (to
output 9V it needed a 10.3V input, which gave my battery pack little room
to relax) and the (I assume) inefficiency of the archos internal stepdown
convertor gave me very short battery lives (only 8 hours on a 12000 mAh
external pack!).

I was limited to a 12V external battery pack, so I've just moved to an
efficient 12V - 5.4V convertor and tapped directly into the battery leads
on the Archos. It ain't pretty but it does give 3+ days of battery
operation.

When used in combination with the record timer patch it makes for a great
long term monitoring device for acoustical studies...


At 08:41 AM 5/5/2003 -0400, you wrote:


>Dave
>
>"an outboard battery pack" ???
>
>Details .... Please
>
>
>
>
>Bubba
>
>-----Original Message-----
>From: Dave Jones [mailto:dave_at_hfpacoustical.com]
>Sent: Friday, May 02, 2003 6:24 PM
>To: rockbox_at_cool.haxx.se
>Subject: Re: Long recording
>
>
>With 1500 mAh batteries I've gotten record times of between 4 and 5
>hours. This was with an older daily build a few months ago.
>
>I've since moved to an outboard battery pack that gives me about three and
>a half days of recording...
>
>
>
>
>Dave
>
>
>
>
>At 09:33 AM 5/2/2003 -0400, you wrote:
> >I asked this question a few weeks ago and received NO replies.
> >
> >I suppose if my name was Bubbette instead of Bubba I might hear
something.
> >
> >Question: How long can you record w/rockbox on a full set of batteries?
> >
> > I realize that battery mAh has a lot to do with it so
>please
> >include your battery mAh.
> >
> >Thanks
> >Bubba
>
>_______________________
>Dave Jones, Senior Project Consultant
>HFP Acoustical Consultants Inc.
>6001 Savoy Dr., Suite 115
>Houston, Texas 77036
>713.789.9400 (phone)
>713.789.5493 (fax)
>www.hfpacoustical.com
>_______________________

_______________________
Dave Jones, Senior Project Consultant
HFP Acoustical Consultants Inc.
6001 Savoy Dr., Suite 115
Houston, Texas 77036
713.789.9400 (phone)
713.789.5493 (fax)
www.hfpacoustical.com
_______________________
Received on 2003-05-06