As most of you know, getting a descent length of VGA monitor cable is a costly thing. With this instructable I'll show you how to make a 15m long VGA cable, out of plain ol' CAT5 network cable.
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Step 1: Strip you filthy cable you! Strip!

To make life a bit easier, strip of about an inch of the CAT5 outer insulation. And behold: 8 precious wires in pretty colors. Make sure you strip about 2/3 mm of the inner wire insulation. Try using an wire stripper. I use my teeth, because Macgyver does it too. Don't make it to long as it could shortcut when fiddling all the wires in the VGA connector.

Step 2: Soldering is fun!

Well the next thing to do is solder the wires to the VGA connectors you bought. The best connectors are male ones. But my local radioshack didn't have em, so he sold me the female ones with an male-male adapter. As long as it works i say! The connector have got the pin numbers on the solderside, and with the help of a scheme i stole from i can solder the right wires to it. Note that im not using an RJ45 connector as shown on the illustration, thats not necessary in my application (very awsome home cinema set).
Just solder the shown colors to the right pins. Good luck with the bridge for pins 5, 10 and 8, naah it's not really that hard =)

Step 4: Check if it works!

Connect the cable to the computer and to the beamer. Make sure your graphic card settings are correct and presto! VGA over a CAT 5 cable! I have no idea how long this cable could be. i made one that was 15m long and it worked perfectly @ 1024x768, so hallaluja! Enjoy!
daleruisky2 years ago
Great Instructable!! Helped a ton. I made a 35ft. cable for a projector mounted on the ceiling. No problem with the image quality whatsoever. Thanks again!
I made a 100+ foot one of these for connecting our church computer to our beamer...and so far every computer I have used, laptop or desktop has worked perfectly. Would recommend to anyone.
NatDaGamer2 years ago
Great Instructable man! Helped a lot, and save me a few pennies as well. Needed a long enough lead to hook up my projector, and now I have one! In regards to bridging the connections, I found using some bare wire in each terminal 5, 8 and 10 all joined together and then soldering the blue dotted cable the easiest way to bridge the connections. :)
junbata3 years ago
Halo ! I am new here.. I have a question? May be you can help me. I want to control may LCD monitor through cutting of one of the pin of D-sub cable and not the Power source. (To Avoid damaged).
May purpose to this is to Always run the CPU and only Blank the screen if nobody used or force to blank screen to stop the user.

NOTE : I will used relay to ON/OFF this LCD by separate control. Through opening of contact of 1 of the 15 pins.
my problem is I dont know which pins is i will going to control OFF/ON.

Hoping for your future answer..
Thanks !

Zigster0074 years ago
 I just did this, I bought the D-Sub Connector and Connector Hood from RadioShack. They already have solder terminals on them. So far i have tried a 50ft cat5e and it works perfectly, i also tried a 300ft cat5e and it did not work. So obviously somewhere in between is the limiter. But for any normal household 50ft should be enough distance to go from one side of the house to the other. 
CrudeBuster5 years ago
The scheme lacks the DDC wires, the video board won't be able to detect which monitor type is attached. But its a good idea nevertheless, I was about to do it but I needed the DDC signals, or else Windows don't let me use some resolutions, and some hacking through settings would be necessary.

Too much ado for a simple extender, for me, but it's useful for a lot of people, kudos to you.

will it damage the source of the video if ever i got troubles on connecting the wires (inverted wire connection)?
redhat115 years ago
can i directly use cat5 to connect the vga port directly to vga port?

means vga port - cat5 - vga port
mlandgraaf (author)  redhat115 years ago
Sure, if you're good with soldering it wouldn't do harm