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02-26-2004, 09:01 AM
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#1
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LAME :)
Join Date: Dec 2003
Location: Clarksville TN
Posts: 262
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DIY DC power supply???
So I was surfing around trying to find the pinouts on itx power supplies so I could use one of my spare dc power supplies for external devices... and I found this...
http://home.concepts-ict.nl/~cybersake/carmp3/
Complete plans to build your own DC power supply, don't know anything about electronics (well at least not putting together a power supply). But I thought someone here might find it useful.
I did a search on the website here and didn't come up with anything, but if this has been discussed before, sorry...
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02-26-2004, 10:14 AM
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#2
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FLAC
Join Date: Jan 2002
Location: Mellansel, Sweden
Posts: 1,299
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look for sproggy, good DIY stuff
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02-26-2004, 11:02 PM
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#3
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LAME :)
Join Date: Dec 2003
Location: Clarksville TN
Posts: 262
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Quote: Originally Posted by jol
look for sproggy, good DIY stuff
Yeah... seen it... no thanks, no DIY crap here... I have neither the time or patience for it, that and everytime I get a hold of a soldering iron I end up with 3rd degree burns  , just hadn't seen it, and seemed like a decent design. Good for people to have options ya know?
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02-27-2004, 01:01 AM
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#4
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Raw Wave
Join Date: Jun 2003
Location: London UK
Posts: 1,819
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Good for people to have options ya know?
Yup 
Good find, thanks for the link. I wonder if it can survive the crank.
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02-27-2004, 01:03 AM
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#5
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Raw Wave
Join Date: Jun 2003
Location: London UK
Posts: 1,819
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Look like it can survive the crank
The spec's of the supply are:
Input voltage: 7.5...19V
Transient protection by a 20V transient suppressor diode
Output voltages:
+5V / 5A -5V/0.2A (Step-down)
+12V / 2A -12V 0.2A (Step-up and Step-down)
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02-27-2004, 06:43 AM
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#6
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Maximum Bitrate
Join Date: Sep 2003
Posts: 586
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This is only an AT type PSU, most modern motherboards require an ATX compliant supply. But it looks good for what it does.
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02-27-2004, 09:31 AM
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#7
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Raw Wave
Join Date: Jun 2003
Location: London UK
Posts: 1,819
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No worries none...that can always be converted as an ATX PSU
Just rip out the ATX function of a sproggy or something, mod here and there and you are done, not the end of the world
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02-27-2004, 12:58 PM
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#8
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Maximum Bitrate
Join Date: Feb 2004
Location: Montreal
Posts: 759
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Ricky: how do you convert it to ATX?
__________________
-Mars
Carputer progress meter:
[----------] - 0%
status:
Changing project. The kiosk I have will end up in the kitchen! Reviewing carPC ideas...
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02-27-2004, 04:12 PM
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#9
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Newbie
Join Date: Feb 2004
Posts: 15
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The only difference between AT and ATX power supplies are the connectors on the motherboard. So, just use ATX connectors instead of AT.
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02-27-2004, 04:34 PM
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#10
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Constant Bitrate
Join Date: Apr 2003
Location: Melbourne/Cranbourne
Posts: 132
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atx also provides 3.3v
__________________
CarPC: Currently in progress...
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02-27-2004, 05:15 PM
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#11
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Maximum Bitrate
Join Date: Feb 2004
Location: Montreal
Posts: 759
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ATX provides 3.3, 5, 12 and have a powerdown connection on the motherboard - it actually controlls itself on/off. Some 5V are still on when the system is off.
__________________
-Mars
Carputer progress meter:
[----------] - 0%
status:
Changing project. The kiosk I have will end up in the kitchen! Reviewing carPC ideas...
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02-27-2004, 07:08 PM
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#12
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Raw Wave
Join Date: Apr 2000
Location: Surrey, UK
Posts: 2,129
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Quote: Originally Posted by ElPiloto
The only difference between AT and ATX power supplies are the connectors on the motherboard. So, just use ATX connectors instead of AT.
Complete rubbish.
5v standby.
3.3v
power good.
motherboard controlling the power on.
I suggest you read the ATX spec. The timings can be critical as the recent(ish) Epia/Sproggy experiences show.
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02-27-2004, 10:48 PM
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#13
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Raw Wave
Join Date: Jun 2003
Location: London UK
Posts: 1,819
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Ricky: how do you convert it to ATX?
As been said...follow the ATX requirement. Personally I havent done it, not exactly straight forward but it can be done.
Its probably easier to base your design using the sproggy. Rip out the sproggys regulator and replace it with this AT PSU regulator.
Hope that make sense
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02-28-2004, 01:44 PM
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#14
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Maximum Bitrate
Join Date: Sep 2003
Posts: 586
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Quote: Originally Posted by Ricky327
Its probably easier to base your design using the sproggy. Rip out the sproggys regulator and replace it with this AT PSU regulator.
How is this one superior to the Sproggy? Why do that? Just curious.
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02-28-2004, 04:33 PM
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#15
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Raw Wave
Join Date: Jun 2003
Location: London UK
Posts: 1,819
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Probably not better but not man said >>> Good for people to have options ya know?
Also efficiency perhaps?
Check the datasheet :
http://www.onsemi.com/pub/Collateral/MC34167-D.PDF
Stepup/stepdown is achieved with a single coil and a mosfet...easier to find components than a transformer. While the sproggy derives its 12V from the regulated 5V by steping up...not that efficient?
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