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Tapping off the power supply for a LCD

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cigardude:

Well I am in the concept phase of a somewhat portable bartop and the smaller and lighter it is, the better it will be for travel. I was originally going to use a notebook for the main system and display but I am running into a major issue trying to find some place to solder some wires to extend the power button so that I can turn it on and off. Now I am thinking about using a mini-itx that I was going to use for something else but I do not want a regular sized power supply since it will be too big. I was thinking of tapping off the PSU for the monitor power so I do not have two power cords running into the cab. Perhaps some fancy wiring might be in order first before I start jumping the gun on this. I just checked a power calculator and it seems that I am going to be using more than I will have. The LCD looks like it will be using 30w of power. I am definitely going to have to rethink the whole concept. Your guys responses do help though!!

RyoriNoTetsujin:

Well, a little Newegg-fu brings this: http://www.newegg.com/Product/Product.aspx?Item=N82E16817104145

So maybe all you need is a non-ATX PSU? The one above measures approximately 6"x3"x1.5" ... That's not a picoPSU, but that's pretty small. Costs about the same... probably not silent... but it's a full 300w PSU!
 
I'm curious to see your design. Any drawings or renderings yet, or is this still in planning?

ninjasquirrel:

I just finished my build and had a similar issue in regards to space and needing mult devices ran off the same psu. Here is the one that I am using- http://www.newegg.com/Product/Product.aspx?Item=N82E16817256063 the dimensions are only 4.92" x 2.5" x 3.94" so it's much smaller than a reg atx. This thing is a beast too! It has a 36amp 12 volt rail...that is what you're really looking for.  The amount of amps your combined devices will draw. So I have my pc (i3 processor, mini itx mobo, video card, etc), 4 pc fans, a 17" lcd monitor, led marquee, ledwiz running off the that one psu  >:D  so far so good! All you need to do...at least all I did, was tap into the 12v line on the molex connector and run that to a barrier strip. From the barrier strip I wired some rca phono quick connects to attach all the misc components.

You do have options though, just need to decide how big of a footprint you have, and how much draw your combined devices will pull and go from there.

cigardude:

@Ryori - No drawings just yet as I am just thinking things through. But once the project is on it's way I will have some nice AutoCAD files for anyone who wants them.

@Ninja - How loud is that power supply? That might be the solution if it is quiet enough. It's a decent size because if I do go this route that cab will need to be bigger than originally thought since I am not using a notebook now. If you have some pics of your cab with this thing hooked up, I would appreciate seeing them. It would give me a better idea of planning this out further.

Thanks!

ninjasquirrel:

It's not too loud at all cigardude...I have 4 fans going at the same time and I can't hear it over those puppies  ;D
These are the only pics I have right now of the PSU hooked up in my build.  If you look through the pics of my bartop, you'll see that I physically have no room at all inside the cab once all the components are in!


Here is the barrier strip used to plug everything into the 12v molex line:


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