Am 2008-02-22 11:51:59, schrieb Douglas A. Tutty: > Hi Michelle > > First, you do know that one can purcase DC ATX PSUs?
Yes but with an efficienci horible... 40-70% only...
I am working with chips from Dallas, Maxim, NXP and LM and get over 85%.
And of cources, if you need a Vin of 24V (18-32V) you are lost.
> Second, the individual drives don't take much power so I think the wire
> size is for mechanical support, I wouldn't go with less than 18 AWG.
I am not realy sure about this since I have for example:
+5 V +12 V
CD-Rom noname 0.35A 1.7 A
CD-Rom Teac CD-512E 1.5 A 1.3 A
CD-Rom Teac CDR-55S 1.8 A 1.8 A
DVD-Rom AsusTek E616A 1.5 A 1.5 A
HDD IDE IBM DHEA-38451 0.32A 0.26A
HDD SCSI IBM DDRS-39130 0.55A 0.65A
HDD SCSI IBM DDRS-34560 0.55A 0.65A
HDD SATA2 Hitachi HDT725032VLA360 0.73A 0.64A
Iomega ZIP 100 0.8 A
So if I take only the AsusTek DVD and the SATA2 disk which are two of
the latest models, then the 4pin HDD connector need already
12V 2.22A = 26.64 Watt
5V 2.14A = 10.70 Watt
-----------
37.14 Watt
And if I see my "Enhance Electronics Co. Ltd" 300Watt PSU which has
20pin ATX connector
6pin ePCI connector
4pin P4 connector
2 cables with three HDD connectors
1 cable with two HDD and one Floppy connector
+ 3.3V 28 A \ 180 Watt \
+ 5 V 30 A / | 279 Watt
+12 V 15 A /
+ 5 Vsb 2 A
-12 V 0.8A
- 5 V 0.3A
one of my problems is, that most DC-DC-Step-Down-regulators do not
support High-Voltage entry and most are limited to 14-16 Vin.
This mean, I need some High-Power (>=25A) DC-DC Step-Down regulators to
get 12Vout from 18-30Vin and then I can build the +5V and +3.3V from it.
> I'll give you the informaition from my ATX PSU's manual:
I have a list of over 50 ATX-PSU's too, but I need real values from the
Mainboards...
> So the only trick for your design is what plugs from the PSU are on
> which 12V bus. Here's the breakdown:
>
> Motherboard connector, 12V is from bus 1.
>
> 4-pin 12V power connector is on bus 2
>
> 8 pin 12V power connector: pins 1 & 2 are from bus 1, pins 3 & 4 from
> bus 2.
For what is the 8pin power connector? -- I have never seen it
> One PCIe 6 pin connector is on bus 1, the other PCIe 6 pin connector is
> on bus 3 (these are for one or two video cards that need the extra
> power)
OK
> SATA conectors are on 12V bus 1
>
> PATA drive connectors are also on 12V bus 1
>
> All of these connectors use 18 AWG wire.
>
> Floppy connector 12V is also on bus 1 but uses 22 AWG wire.
Hmmm, for example, can this work:
ATX-Connector +12 V 3.3A = RECOM RP40-2412SE
+ 5 V 8 A = RECOM RP40-2405SE
+ 3.3V 12 A = RECOM RP40-2403SE
+ 5 Vsb 2 A = RECOM PP10-2405SEW
- 5 V 0.3A = RECOM ???
-12 V 0.8A = RECOM ???
Which mean, on each of +12V, +5V +3.3V I have a maximum of 40Watt
independant which will definitivly work for a 32-Bit Socket A CPU
from Duron over Sempron to Athlon up to 2000 MHz
My Workstation is a Sempron 2200+ (1500Mhz) with 1 GByte of memory
and is working fine with it, but switching to an Athlon 3000+ kill
the PSU (no, not the 3.3V but the 5V).
> Given the design of this PSU, I can't say how much amperage goes, e.g.
> only to the MB or for each drive. However, look at it this way.
This what I am looking for.
Maybe I will make a 24pin-ATX-Adaper in which I put ANALOG Ampermeters.
The problem is, taht some CPU's are sucking realy 90 Watt alone...
> I suppose the question is how much of a computer do you intend to power
> on solar power? Do you need a video card that requires a PCI-e? How
Definitivly not.
> many drives do you want to be powering? I don't want to open up my box
On my Workstation I am testing a IDE/CF-Adapter with a 4 GByte SanDisk
UltraII but I think I will switch to a cheaper 2 GByte one since I have
no KDE/GNOME On-Board. /tmp and /var is in a ramdisk where the later
one is saved and restored from an init script at boot and shutdown
to/from a second CF-Card of 512 MByte as TAR-Archive which works perfectly.
On my Test-Server I have curently the 3W8500S-8LP with three normal SATA
Hitachi TravelStar 80 GByte (smaler where not availlable) in a Raid-1 plus
Hotfix and each drive has ONLY 5V/1.3A.
Now I like to install four Hitachi TravelStar from the E5K or E7K series
which allow 24/7 use on load... it seems, the consuming 5V/1.4A.
One thing I do not know is, can the "normal" 80 GByte SATA TravelStar be
used 24/7 if there is only the OS on it and more or less NO access?
> to read the rating on my Seagate Barracuda 80 GB SATA drive while I'm
This is a 3"5 drive right? (See above the rating for the Hitachi SATA2,
yours should be something like this too)
> Let me know if I can help in any way.
:-)
As I have writen, I like to make a 24V-DC-PSU modular, so one modul for
the ATX-Connector, one for the ePCI, one for the P4, one for the HDD's.
Which mean, I can addapt the PSU to my needs...
Last thursday I was in a Electronic-Shop in Offenburg/Germany and have
bought AMP-Connectors but unfortunatly I have gotten only the 20pin from
the mainboard... Now I am looking for the 2pin, 4pin, 6pin, 8pin and
24pin connectors to put on the modular boards.
Note: I have the need to replace 3 Workstations (Office, Devel and
Multimedia), 6 Servers and one Router (see link above)
<http://freenet-homepage.de/linux4michelle/to_replace/>
(if it does not work immediatly, the new files are ongoing to
be uploaded...)
Thanks, Greetings and nice Day
Michelle Konzack
--
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)
signature.pgp
Description: Digital signature
