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 Post subject: Power Supply Molex connetor info
PostPosted: Tue Jul 07, 2009 7:14 pm 
Klamath
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Ok simple stupid easy question to the eggheads, got a little project here and need to modify a molex drive connector from my PSU to power a 12 volt item, which is the 12V lead, the yellow or the red ? Thanks in advance and yeah, I know silly stupid easy question and no, I don't have a multimeter handy !


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PostPosted: Tue Jul 07, 2009 9:50 pm 
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if im not mistaken i do believe red is 12v and yellow is 5v.


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PostPosted: Wed Jul 08, 2009 4:30 am 
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*Waits for Denis63 to come in and give long speech about PSU voltages and how he uses PSUs for other things outside of a case*


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PostPosted: Wed Jul 08, 2009 4:33 am 
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graydiggy wrote:
if im not mistaken i do believe red is 12v and yellow is 5v.


no.

red = 5v
yellow = 12v
both black = common ground

see here


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PostPosted: Wed Jul 08, 2009 4:45 am 
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See which ones a molex fan connects to. they are 12v.





Ted


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PostPosted: Wed Jul 08, 2009 6:28 am 
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Red=5v
Yellow=12V
Black=ground

That's the way it is.


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PostPosted: Wed Jul 08, 2009 6:32 am 
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oops... :? my bad. i learn somethi8ng new everyday.


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PostPosted: Wed Jul 08, 2009 6:38 am 
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You can also get 7volts by using the Red and Yellow FYI.


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PostPosted: Wed Jul 08, 2009 9:10 pm 
Klamath
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Thanks folks....got the data I needed from you guys n gals.....off to mod up something cool.....well not really that cool...re-using a couple of fans from a PSU that went south (big burnt up coil !)....as case fans.....real interesting stuff....not.

For those who want to know how the PSU burned up, take an Athon X2 7750 overclocked to 3.1Ghz, throw in a 7950 GX2 and a woefully inadequate PSU that was rated at 500 watts and she burns up nicely.


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PostPosted: Thu Jul 09, 2009 6:37 am 
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ouch. that's why the PSU s the most important part in the computer. can't do or trust anything without a good one.


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PostPosted: Thu Jul 09, 2009 8:12 am 
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CrashTECH wrote:
You can also get 7volts by using the Red and Yellow FYI.


Joo aren't srs are you? Please tell me you aren't.


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PostPosted: Thu Jul 09, 2009 8:13 am 
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bigtoyota479 wrote:
CrashTECH wrote:
You can also get 7volts by using the Red and Yellow FYI.


Joo aren't srs are you? Please tell me you aren't.


*facepalm*


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PostPosted: Thu Jul 09, 2009 8:55 am 
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Defiant wrote:
bigtoyota479 wrote:
CrashTECH wrote:
You can also get 7volts by using the Red and Yellow FYI.


Joo aren't srs are you? Please tell me you aren't.


*facepalm*


The reason I ask, is because you CAN get 7 volts, but you don't use both the red and yellow wires. You use the yellow wire, and the 5v GROUND. NOT the red and yellow wires together. I'd hate for someone to attempt what he said and see sparks.


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PostPosted: Thu Jul 09, 2009 9:01 am 
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bigtoyota479 wrote:
Defiant wrote:
bigtoyota479 wrote:
CrashTECH wrote:
You can also get 7volts by using the Red and Yellow FYI.


Joo aren't srs are you? Please tell me you aren't.


*facepalm*


The reason I ask, is because you CAN get 7 volts, but you don't use both the red and yellow wires. You use the yellow wire, and the 5v GROUND. NOT the red and yellow wires together. I'd hate for someone to attempt what he said and see sparks.


You may be *correct* on the wire situation but if it is 5v it isn't ground. Ground = 0v.

I only mentioned that because I used a similar principal with the turn signals on my car. The side markers are connected to two positive voltage wires (damn near 100 certain they are anyway). Enabling them to flash in alternating sequence with the front turn signals. This was not a factory configuration, something I re-wired.


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PostPosted: Thu Jul 09, 2009 9:03 am 
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I was pretty damn sure I was right...

Quote:
As an aside, you can get 7 volts from the +5 V and +12 V outputs -- the +5 V is considered the negative (GND) and +12 the positive -- some geeks will use this combination to run their fans at a lower speed to reduce noise.


http://web2.murraystate.edu/andy.batts/ ... supply.htm


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PostPosted: Thu Jul 09, 2009 9:05 am 
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Fuck on a stick. I totally fail today. Yeah, it is the red and yellow wires. I totally misread the article where I found this information. Yellow is positive, and the red is used as a 5V ground. Fuck.


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 Post subject:
PostPosted: Thu Jul 09, 2009 9:08 am 
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bigtoyota479 wrote:
Fuck on a stick. I totally fail today. Yeah, it is the red and yellow wires. I totally misread the article where I found this information. Yellow is positive, and the red is used as a 5V ground. Fuck.
it is all good buddy, don't be so hard on yourself lol :)

Found another semi-related article worth noting:
http://www.overclock.net/faqs/37995-how ... -fans.html


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 Post subject:
PostPosted: Thu Jul 09, 2009 9:12 am 
Klamath
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Spartacus wrote:
ouch. that's why the PSU s the most important part in the computer. can't do or trust anything without a good one.


Yeah, this is why the system now has a Antec Basiq 500 watter, works just fine, learned about good PSUs as my main tower run a PC Power & Cooling Silencer Red 750...it needs that kinda juice.


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PostPosted: Thu Jul 09, 2009 2:19 pm 
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Not that it matters at this point but what the hell:


+12 Volts is Yellow

+ 5 Volts is Red

Common is Black

All outputs of a PSU share the same Common.

Therefore the Red wire is +5 Volts with respect to Common and the Yellow wire is +12 Volts with respect to Common. However the Yellow wire is only +7 Volts with respect to the Red wire as the delta between +5 and +12 is +7 with the Red wire serving as the Common to the Yellow wire. Algebra says so :) .

The problem with playing the 7 Volt fan game is it is easy to get confused and short your PSU. The common everyone loves to use is not used.

Gawd, you have to love this stuff huh?

Ron


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