How to Make a VGA Splitter.

In this instructable i will show you how to make a VGA splitter that can switch between two inputs or two outputs. this instructable is a modification of a printer(parallel) splitter.

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Step 1: What You Need.

Here's what you need to make this:

-parallel splitter
-parallel cables
-3 radio shack 15-position female VGA plug
-headphone style jack (female)
-multi. voltage DC power suply (3v)
-soldering pen

Step 2: Beginning the Assembly.

In this step you will need to find a valid possitive and negative pin on the cable.

To do this you need patients and an ammeter.
On my splitter, pin 10 is the possitive and pin 20 is the negative. In order to find the pos. and neg. wires within the cable you need to clamp your meter to pin 10 or 20 (you'll have to do both anyway), then, after cutting the cable in half, you have to strip back each wire and, with the other cable of your meter, eliminate each wire until you've found the one you want. then do it again with the other pin/wire.

Step 3: Attatch the Power Jack.

now you need to attatch the power jack(headphones) to the possitive and negative wires.
first tin the wires then solder them onto the jack.

Step 4: Attatch the VGA Plugs.

now all you have to do is solder wires onto the VGA plug.
no order is needed but you will want to write down that wires go where.

Step 5: Finnishing Up

now all you must do is repeat step four on two more cables using the wiring diagram you wrote down.

cut off excess wires from cable.

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    8 Discussions


    6 years ago on Step 4

    VGA Splitters relatively inexpensive. Rather than spending time on making one you can buy a unit online. It is always recommended to go with powered VGA Splitter solutions for optimal video quality.


    9 years ago on Introduction

    What exactly do you mean by the "positive and negative" of the splitter? Are there pins on the DB-25 which will give you the voltage rating of the power supply (in the event you are using a powered splitter)? And an ammeter is to measure current. Could you please specify what you mean by the "positive and negative of the splitter"?


    Reply 11 years ago on Introduction

    Thats because his phraseology is just slightly inaccurate. A splitter technically takes one input and propagates it to two outputs simultaneously. These devices are usually passive (not powered), so the output signal is weaker than the input signal (sometimes this kind of splitter is known as an attenuator). Most often you see this kind of device in co-axial cable or satellite TV setups. On the other hand, a switch takes a source and connects it with either the A or the B destination, or vice versa, as thatonekid says in the instructable. It's accomplished inside with a chip called a CMOS bilateral switch. There are all sorts of varieties of these, with various properties. The most important one here being bandwidth. A parallel data switch only needs to switch a low-bandwidth digital signal. VGA is much higher bandwidth and uses analog signals, so you run the risk of having problems if the data switch in question didn't use high quality parts. In addition there's the problem off crosstalk, where one signal affects another one nearby it. This can cause ghosting or artifacts. This is why KVM (keyboard-video-mouse) switches are usually quite expensive compared to parallel, serial, and USB switches.


    Reply 11 years ago on Introduction

    the soldering pen that used is made by Ungar, they make some realy nice soldering equiptment but they're expensive.


    11 years ago on Introduction

    I like the idea, but I really would have liked to have seen pin assignments (aka: pin 1 VGA = pin x Parallel). Also, it might help to put hot glue over the soldered pins, essentially making a boot for it. Other than that, it's a pretty ingenious idea. <br/>