Hello Henrique,
Am 2008-03-08 14:19:38, schrieb Henrique de Moraes Holschuh:
> Well, it looks like what I learned on graduation near ten years ago still
> holds. If you are going to look for the best chips to do something, you
> will find stuff that is MUCH better than what you get in consumer goods.
:-/
> And it is not even that more expensive, it's just that every cent counts
> when you are doing runs of hundreds of thousands parts at a cut-throath
> margin :p
But if I pay e.g. 35 Euro for a 420Watt CobaKing which has an efficiency
of arround 78% and count the Energy, I pay more because the bad
efficiency I can build my own PSU and I have only to find peoples which
want to share with me arround 150 of them, then all what I have invested
is payed except the Infrared-Soldering Station...
> That should be trivial to do in Europe. I don't know about cheap, but you
> should be able to just directly ask the manufacturers of professional
> soldering equipment for a number of resellers, and start asking around for
> prices. Now, if you want it used for much better prices, then yes, it will
> take some doing to find one :-)
It seems, there is only ONE big manufacturer for it: AOYUE
AOYUE-710 1950 Euro Infrared Welding System
AOYUE-720 1999 Euro SMD Reworkstation, IR Welding System
AOYUE-BGA9000 9999 Euro IR-Station, Welding System for BGA-Components
<Ggmpf>
Now I am looking into professionel auctions where such equipment is sold.
> Make sure they are very stable under spiked loads, that's when the RAM chips
> start flipping bits :p Some don't work well in either extremes of the load
> curve either, and that can be a factor (you might end up needing two 5V
> regulators, one that powers up the boards, and another that powers up the
> disks, for example, to have the more critical load (boards) that has also
> less variance, on a more "tunned" regulator).
This is, what I already do...
<http://freenet-homepage.de/linux4michelle/electronica/24V_DC_Modular_ATX_PSU.html>
> > Currently I have my Opteron 140 running on a test installation...
>
> Just remember that if you use mobile CPUs or chipsets, than can do even more
> drastic power load changes than an Opteron (which doesn't even try to
> conserve power very much, to begin with).
:-)
If I fire up my Opteron, it is the same, as attaching a 10.000µF Elko to
each output and do a coldstart... (The ATXV12 spec is taking about a
6000µF pig on the 12V1 and 12V2 but I do not have such Electrolyt
Condensators... Only the "a little bit" bigger ones)
> BTW, depending on what you need to do with the embedded computer, have you
> looked at the stuff from routerboard.com and similar vendors? They are much
I have already bought from routerboard (the 4-Port VIA-Rhine)...
> friendlier to embedded and custom designs than a standard PC motherboard.
But very expensive! And of course, since I have up to eight 2"5 E5K/E7K
drives in some of my computers I have to buld my own PSU anyway...
> Do you have any photos of the glue on the planar card that we could add to
> thinkwiki? The harware hacks section of thinkwiki looks too feeble right
> now :-)
??? -- I am missing something?
Hmm and no, I do not have photos of it.
> By ready-made, I mean in a dust-tight, air-tight, water-tight extruded metal
> container with a few wires sticking out of it, and a 5-year warranty with a
> better than 20-year MTBF :-)
Unfortunatly they have not more then 40Watt (the 24V Types)
<http://www.recom-international.de/>
and VERY expensive!
24V => 3.3V/12,1A
24V => 5.0V/8A
24V => 12V/3.3A
arround 75 Euros per DC-DC-Converter but very high eficiency.
> They won't last nearly as long as they could if the charger supervisor
> doesn't do thermal compensation (if you can't somehow make sure the
> batteries are always at 25°C), proper burst and float charging control, etc.
Thats right... and it is more worse sinc I want o go to Morocco or
Turkey which have a little bit different temperatres then Germany
or France.
> There are good lead-acid gauge chips out there I think (it is at least three
> years since I looked at battery gauge chips), that can do it all for you.
I know, but this is for the charger (second project) I build.
> If you can monitor each battery, instead of the bank, that's much better
> too. You get to notice one is going bad before it damages the entire
> battery bank.
The problem is, if you whatch each battery seperatly, how do you choose
shunt resistors? I can have up to 250A... divided by 10 battery sets
are only 25A each, but if a battery die I run into problems...
This mean, I have to protect each battery with o Power-MOSFET and
full current control... Something a little bit to big for a DS80C404,
which mean, we are back by a ARM with nice CF-Card and bigger memory
and Debian GNU/Linux on it...
Thanks, Greetings and nice Day
Michelle Konzack
reading into the "ARM11 Technical Reference Manual" of 836 Pages
(the 350 pages from ARM922T are already eaten)
--
Linux-User #280138 with the Linux Counter, http://counter.li.org/
##################### Debian GNU/Linux Consultant #####################
Michelle Konzack Apt. 917 ICQ #328449886
+49/177/9351947 50, rue de Soultz MSN LinuxMichi
+33/6/61925193 67100 Strasbourg/France IRC #Debian (irc.icq.com)
Attachment:
signature.pgp
Description: Digital signature