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PC Wiring Stuff 12v DC

09/30/05

Basic Wiring Pin Outs

y 20 & 24 Pin ATX Powery Auxiliary Power (Molex, Floppy, SATA 3-Pin fan)y USB & Fire Wire

Tricks & Tips

y PSU By-Passy 4-Pin Molex Conversiony Fan Busy Fan 4-Pin to 3-Pin Conversion

Things to keep in mind before any project.

y Never touch or play with wire while the PSU is plugged in!!!!!!!!!!!!!!!!!!!!y Keep in mind you always want to be very careful when using power and never assume anything

is correct double check and re check..y Its a good Idea to draw out your ideas before any work is done.y If you are a novice or first timer bounce the your ideas off someone else that has experience in

wiring.y Most important is Planning, 90% of your time should be spent on the planning part the actual

work is very little.y Do it right the first time and work safe...y Remember you are dealing with electricity and it must be respected bad things can happen if you

are not careful..

Basic Wiring Pin Out Diagrams for ATX Style PC's

Lets start this article with a list of the most common connectors you will find in a PC.. Then we canexpand and discuses just how to make cables and convert voltages and uses. Most of the wring we willbe dealing with are basic PC AC/DC power from an ATX style power supply..


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Illustration1.1: 4-Pin12v Power/ 24-PinATX Power

Illustration1.2: 20-PinATX Power

Auxiliary Power Wiring


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Most ATX power supplies come with one of two power connections for you motherboard. Either a20-

pin or a 24-pin versions they do make converters if you happen to have the wrong type for yourmotherboard...

Illustration 1.3a: Standard 4-Pin 12v Molex Connection

Illustration 1.3b: Standard 4-Pin 12v / Floppy / Serial ATA / Aux Power / Molex Connection

There are two different standard 4-pin Molex connectors a 12v used for drives and CD/DVD-ROM'sand the 5v Floppy type connectors. Some power supplies the newer versions come with two addition

power connection types for newer products like SATA and PCI-e ports blow are examples of these....


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Illustration1.4: Standard3-Pin12v Motherboard(FanJack)

USB

& Fire Wire Diagram

You may also run into 3-pin variable 12v Fan connections used on your motherboard. Note that somefans will come with two or three wires the third wire is a sensor wire used to evaluate performance and insome situation regulate the voltage running to the fan...

Illustration 1.5: DefaultIEEE1394 standard Pin out Fire Wire


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Illustration1.6: DefaultUSB PinoutMotherboard

Twoothercommonwire connections foryourmotherboardare the USB andFire Wire pinouts. Theseare usedvery frequently foradditionalportscommonly providedwiththe newercases for frontterminals.. Asyoucansee from the imagesabove the USB andFire wire have very similarboardmountsbutthe wiring isvery different. Itisimportanttoalwaysreadcarefully the documentationandmake sure

youuse the properconnectorsinthe properplace.. Justbecause the look the same doesn'tmeantheyare..

Warning This article is design to educate the PC enthusiast any changes to wiring or products can and will void

warranties.. These are strictly guidelines anyone that uses them is doing so at your own risk...

Tricks and Tips for conversion cables and Wiring How To's

Bypassing a power supply connector to turn on a PSU.

What you need to do from the 20-pin motherboard Mole connector take a wire or a dual mail Molexpiece and bridge or short out the PC_ON and the Ground wires.Use the diagram and photos above for

examples.. An alternative for those not comfortable with wiring is to buy a jumper madespecifically for this task they are very inexpensive but considering what they are they


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should be.. FrozenCPU.com has them and example is HERE. This is useful for checking out drivers ordevices without contaminating a system or requiring the us of an existing PC.. We use this all the time totest fan's and lights..

Illustration 2.1: 24-Pin ATX Jumper Diagram


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Illustration2.2: 20-PinATX JumperDiagram

Conversation for 12v 4-Pin Molex Terminals

This section will show you the basics needed for most wiring setup on a PC. most combinations usingstandard Molex connectors. This is very useful when hooking up a series of fans and you need to makewires for specific voltages.

Illustration 2.3: Image on Left is the pin out for a 7volt setup the right is for 12volt Both are forPeripheral or stock 12v 4-pin Molex connectors.......


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Molex Floppy Terminal Pin Out

PinName Color Description1 +5V Red +5 VDC

2 GND Black +5 V Ground

3 GND Black +12V Ground (Same as +5 V Ground)

4 +12V Yellow+12VDC

Fan Wiring and the Fan Bus

Don't Let this happen to you!!!!!!!!!

One of my personal pet peeves when it comes to PC's is the fan connectors I can't stand wires

everywhere. It not only looks bad but allot of the time it prohibits airflow increasing internal case tempand causing your PC to run inefficiently.. That is why I always suggest getting rid of them pesky extra fan

connectors whenever possible.

One way of hiding and consolidating your wire problems is with a fan bus. A fan bus also providesmultiple extra ports for the serious Over Clocker or gamer to add some extra air flow. The idea behind a


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fan bus is simple.. Take a bunch of wire ends make a series of connectors and run a current threw them.How fancy you get is up to you add in switches diaphragms for speed controls LED to power indicators..Anything you feel fits your PC and style. Just about every review site has their version so I will just link afew of my favorites. Hopefully they give you the idea..

y http://www.fanbus.com/y http://www.twistedmods.com/article.php?artid=193y http://www.7volts.com/pcm_baybus.htmy http://www.virtual-hideout.net/guides/fanbus/index.shtmly http://www.pcmoddingmy.com/content.php?article.83y http://www.casemodgod.com/Howto-story--34.html

4-Pin to 3-Pin Fan ConversionAnother way to deal with the overload of4-pin Molex Fan connectors is to convert from the 4-Pin to

the 3-Pin motherboard terminals if you motherboard has extras that is.. Depending on the fan it is prettystrait forward.

Start with the fan clip and strip the wires leading to the Molex terminal.. Purchase some 3-pinterminals along with the ends. Using the diagram bellow make sure you hook up the pin properly. Mostfans using 4-Pin Molex connectors do not have a sensor lead so you will only need the two pinsconnected to run the fan..

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