My LCD Projector Deadline 1 month!!! - diyAudio
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Old 26th October 2004, 03:11 AM   #1
Georgie is offline Georgie  Argentina
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Post My LCD Projector Deadline 1 month!!!

Hi DIYers!

Well, Im a total Newbie to this But I will try to finish it in One Month! Hope to have it ready for Nov 25!

Ill be posting my results almost every day, so check it out!

Starting point:

I have a Sawyers Slide projector, Very Old but never been used.
Im planning to take several parts from it:
Condenser lens, 4" FL Projector Lens, cool Electric Focusing system, etc.

Need to buy the fresnel lens, LCD Screen, and coolers. Im Worried about stripping the LCD! Is it easy? Ill let you know.

Lamp: For all that Ive read the way to go is a Metal Halide one.
So Ive Chosen a 150W MH lamp, with 12000 Lumens and 4200K Color Temperature. Apparently 4200K is the correct color temperature to use. According to Color Temp Charts, this Color temp makes white look white. While higher color temps, makes white look blueish...(According to what Ive read in diyaudio.com)

Well, thats all I have for now. See you soon...
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Old 26th October 2004, 05:48 PM   #2
Yazan24 is offline Yazan24  Jordan
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Dont worry abt a deadline, I built mine in 3 days
and the quality is great!

Cooling systems are easy to build, u get computer fans and u rewire them into a 9v convertor.

And evewrything else is arranging,

The hardest mart IMHO is the actual wood building of the case. If your doing it your self its going to be hard

But GOOD LUCK
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Old 29th October 2004, 01:26 AM   #3
Georgie is offline Georgie  Argentina
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I run a optical test:
Well, I finally got a test image projected to the wall. My lenses are not the right ones, because my fresnels have 300mmFL and my projection lens only 100mm.
I tested it with a 50W Dichroic lamp, so it was really dimm and the spot of the light source on the wall made it even worst.

I was wandering? If the image in the LCD is for example a black scene, this means that the lcd screen will "block" almost all the light that is passing through it? Am I right?
I thought this, because when you put a 300mmFL Fresnel separated 300mm from the light source, what you get on the wall is a clear and amplified image of the bulb. Undesirable!

So the lens arrange in this test was the following:

Lamp 50W>>>300mm<<<fresnel1 -- transparency film --fresnel 2 >>>300mm<<<60mmFL condensor lens>>> aprox80mm>>>100mmFL Projector lens.

The transparency film is to work as the image of the lcd. I printed on it some colour figures, to see the projected result.
The two things that i believe make the test kinda unsuccesful is the transparency film and the low output lamp.
these weekend Ill be buying the 150WMh and the lcd, and perform this test again.
Eventually I will have to get, in order to obtain better results, a new projector lens and new fresnels, that match in FLength.

Im Really worried about stripping the LCD, that brown fragile cable! Wish me luck!

Ill post some pictures soon.

Thanks Yazan24!
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Old 29th October 2004, 02:41 PM   #4
ancorp is offline ancorp  Canada
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Rember that an lcd will eat up ALOT more light than a transparent sheet. Lcds eat up like what 80% of the light?
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Old 29th October 2004, 02:42 PM   #5
ancorp is offline ancorp  Canada
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oh ya Good Luck!
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Old 30th October 2004, 01:16 PM   #6
Georgie is offline Georgie  Argentina
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Yesterday was a lucky day.
I bought a 3M 200mm FL Fresnel lens New in box! for $50
And a 3M DLP 210mm Projector lens in very good condition for $25! Nice couple!

So Im really happy. In A few minutes Im going to buy the Mh lamp and the lcd screen and will spend all weekend trying to figure out how to put together all these pieces in the best way possible.

expect pictures soon!
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Old 30th October 2004, 07:49 PM   #7
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Quote:
I bought a 3M 200mm FL Fresnel lens New in box! for $50
Thats kinda a rip off buddy, way over priced.

Trev
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"Every technique can be used in a great many ways, but mastering it, thats what realy counts."
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Old 31st October 2004, 03:57 PM   #8
Georgie is offline Georgie  Argentina
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Ace3000! Ive read all your posts!

Im Sorry, ive putted the price in Argentinian Pesos.

$50 pesos = 16 US dollars.

In total, for the fresnel + the projector lens I paid 25 US Dollars.

I was was ripped off with the lcd, though... u$d240

And the 150W mh lamp with ballast u$d 40
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Old 31st October 2004, 09:09 PM   #9
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Hi Georgie, my name is Julin and live in Argentina too, but in Buenos Aires !.
I'm testing my prototype projector using page magnifiers instead of good quality fresnells and works well but I want to obtain one of them in the near future. Can you tell me where you buy the fresnell and projector lens ?
Good luck with your projector !


Julin
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Old 31st October 2004, 09:21 PM   #10
Georgie is offline Georgie  Argentina
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Hola Andronico...

Quote:
Can you tell me where you buy the fresnell and projector lens ?
Well, i bought them im a computer store.
The fresnel is the spare part (Repuesto) of an Overhead projector.
You should be able to find it in BA. Try http://www.imagenesweb.com.ar
And the guy from the computer store, also sold me the projector lens, from a dismantled 3M DLP Projector...Its used.

http://www.imagenesweb.com.ar

My next step is Stripping the LCD, have you done this already?

Bye!
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