DIY Projector 2.0

good place to post your setup and get feedback from others.

DIY Projector 2.0

Postby rembetis on Wed Feb 14, 2007 2:13 pm

Well, after finishing a projector for my little brother (see my Media On-the-Go Kart thread), I was pretty eager to start one for myself. I won't go into the nitty gritty, as the details are already spelled out in gruesome detail in my PLOG (projector log) on the Lumenlab forums, but I thought some specs and pics might be of value to anyone else interested in DIY projectors.

Specs
LCD: Toshiba SD-P2800 portable DVD player (ebay find & fix), 800 x 480.
Lenses: 165mm FL precondenser lens (surplushed), Rear fresnel 200mm FL (3dlens.com), front fresnel 385 FL, projection triplet 342 FL (latter two harvested from 3M 9750 overhead projector)
Lamp: 150W GE ceramic metal halide
Ballast: 150w F-can / m102/142
Other: Schott KG1 heat absorbing (IR/UV) glass, super high contrast polarizer from polarization.com

Total cost: ~ $200

(Very rough) Initial sketch
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parts for light engine
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light engine assembled
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test bed (red circle indicates where hirose cables from portable player are connected)
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first test fire (light leak across Darla's face)
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enclosure (needs finishing)
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Screen shot (after some tweaking, about 100" diagonal)
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Postby Marbles_00 on Wed Feb 14, 2007 6:06 pm

THAT'S F%$KING AWESOME!!!

Seriously...good job.
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Postby rembetis on Wed Feb 14, 2007 6:42 pm

Thanks Marbles. You're a good man for a pat on the back :)

In in the interests of full disclosure I should say that the projection (and DIY projectors in general) is only that good when the room is in total darkness and you're watching an animation movie. Films with very dark scenes are sometimes problematic, but I believe that is true of some commercial projectors as well.
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Postby dalanik on Wed Feb 14, 2007 7:38 pm

My god! Really unbeliveable! Cool...
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Postby samgreco on Wed Feb 14, 2007 10:40 pm

WOW! I am indeed impressed. You have me wondering what I can do....

My wife is so going to hate this....
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Postby scottw on Wed Feb 14, 2007 11:37 pm

That is one of the best DIY projectors I have seen. I have always wanted a projector but they are still expensive to me. I looked at the DIY's before but a little out of my league.

Keep the pics coming!!!!
Scott
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Postby rembetis on Wed Feb 14, 2007 11:49 pm

Thanks for the kudos, guys, but honestly my projector is half-assed compared to some of the designs over on Lumenlab and the German site Allinbox. Lots of people are doing 720p designs now, and even a few 1080is.

Check out some of these links. Truly awe-inspiring.

Projet de Slize
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The Gnu's Widescreen
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Postby scottw on Wed Feb 14, 2007 11:56 pm

That does look great but don't cut yourself short, good job :wink:
Scott
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super high contrast polarizer from polarization.com

Postby stomp on Fri Mar 02, 2007 6:54 am

Where do you place your super high contrast polarizer ? in front of lcd between lcd and F2? Or after the Schott KG1 heat absorbing (IR/UV) ?

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Umake some gooooood jobs !! o.O thx alot!!
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Postby abobader on Fri Mar 02, 2007 9:16 am

dalanik wrote:My god! Really unbeliveable! Cool...


I second that!
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Re: super high contrast polarizer from polarization.com

Postby rembetis on Fri Mar 02, 2007 12:14 pm

stomp wrote:Where do you place your super high contrast polarizer ? in front of lcd between lcd and F2? Or after the Schott KG1 heat absorbing (IR/UV) ?


The order of components now goes:
reflector > bulb > Schott glass (now replaced with a hot mirror which still blocks IR buts lets more visible light through) > pre-condenser > rear fresnel > polarizer (affixed to fresnel) > LCD > front fresnel > projection lens.

(In the picture above both fresnels went before the LCD. This is called an unsplit setup and typically results in a sharper image, but the split setup I'm using now allows for some keystoning).

And just to clarify, the polarizer replaces one I removed from the front of the LCD with the antiglare layer (which increases brightness and contrast). Because the lens inverts the image. the LCD faces backwards and is upside-down.
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Lumenlab

Postby bigbill117 on Wed Mar 28, 2007 6:34 pm

Good to see a fellow lumenlab member over here.
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Re: DIY Projector 2.0

Postby rembetis on Wed Jun 06, 2007 7:27 pm

Just thought I'd pop back in and display my latest project -- I ended up upgrading the LCD in the 2.0 projector mentioned in this thread to a 10" 720p panel (hi-def baby!), which freed up the old panel. On a lark, I decided to try to fit it and a bunch of spare parts inside an old pc case.

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Not bad for spare parts :)
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Re: DIY Projector 2.0

Postby bmblank on Wed Jun 06, 2007 7:38 pm

Gladiator!
:)


You could probably pass that computer case projector off as a store-bought one.. Then again I don't know why you'd want to. Half the fun making it known that you built that from scratch..
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Re: DIY Projector 2.0

Postby Marbles_00 on Thu Jun 07, 2007 12:13 pm

rem, if i wasn't such a homophobe, I'd kiss ya (not really a fear, but don't care to be around it). I have a couple of old computers kicking around, and the wife's been bugging me to get rid of them...you have given me a new front in reasons to keep the cases at least.

I seriously have to start looking more into these DIY projectors, now that my zoning project is starting to wind down.
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where my:
    -Music Distribution
    -HTPC
    -MediaPVR
    -UnRAID box
    -OTA
are all discussed.

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