DIY Video Projector Part II

[prjctr_builder]

Originally posted by Gunawan W
woneill,
I will use hanging cabinet (cupboard?) behind my sofa.
The setup goes like this:
On top is Lamp housing facing downward, next is fresnel then LCD panel, before the beam hit the bottom of cabinet, I will place adjustable mirror to bend the beam 90 degrees to the cabinet door. The mirror also can use as keystone correction too.
Last, I will place the lens set (with zoom adjusment) at the cabinet door.

this is exactly what i am talking about, we cam eto a stall, and most of the people are satisfied with the results we have now. i think that we need to work on a way to make the construction SMALLER.

aleksey

[woneill]

Aleksey,

I was checking out the Osram site last night, and they mention that the 575W bulbs can be used with a 400W ballast - giving longer life. They don't specify whether this is the standard magnetic ballast, or a special electronic type.

I searched around the web and found a number of "pulse start" 400W ballasts that might do the job. (The pulse start ballasts include an igniter...)

I suppose a number of emails are in order to tech support people to see if any of the ballasts are ACTUALLY rated to drive the bulbs without going up in a puff of smoke...

Gunawan,

Cool stuff! I thought you were suffering distortion in the projected image... My experience is that by using this arrangement, you DO get a sharper, brighter, and more contrasty image overall (even with one of the cheap page magnifyers from Staples).

The Proxima 9100 chassis I mentioned, that made me investigate this effect, has a beautifully sharp image: text, even at small fonts, is very sharp and legible - even after having replaced the "guts" with a much lower-res 640x480 projection panel. Admitted, the fresnel that is included with the 9100 is VERY nice quality - but I'm sure that other fresnels of this quality are generally available at reasonable prices.

Bill.

[Marklar]

Originally posted by prjctr_builder
Is having the 750 hour lifo on the 575W bulb out of dukane 680 the only disadvantage? cause i wanna try to use it. the reason is that i do not wanna spend any more money buying the ballast and other things.


aleksey

Thats what I was using for a while until my ballast blew up. I tryed to fix it but I couldnt find the part for it.

[Jernau]

Hi all again

http://www.hexachain.com.tw/modules.htm#b

The HC6401A LCD panel shown on there - has anyone ever taken one to bits, or know what's inside and wether or not it can be used in a projector?

Cheers

Jernau

[cowanrg]

it really depends on price, but unless this is the cheapest panel we've found, i don't think its worth it. the res is alright (still that low 234 vertical), but the contrast ratio is what bothers me. its only 120:1. which, isn't bad, but its not all that great, especially for a normal LCD panel. ususally they are much higher.

plus, for all the comp users out there, its ONLY NTSC. if its cheap, could work, but hardly a new find.

Originally posted by Jernau
Hi all again

http://www.hexachain.com.tw/modules.htm#b

The HC6401A LCD panel shown on there - has anyone ever taken one to bits, or know what's inside and wether or not it can be used in a projector?

Cheers

Jernau

[Marklar]

Well I built my new site its starting to come togather real nice check back often I will be starting projector #2 soon. hommie.net

[SuperZoboo]

Marklar,

Rockin Site! The more we pool what we've learned and offload it to well organized sites the quicker newbies come up to speed and progress continues! I'll admit that for sure you and some other guys have made some nice work, so far I've taken the easy way out. Next week I'm ordering the bulbs and reflectors and going nuts.

In fact, I plan on posting what I hope to order and posting it for review beforehand. What can you tell us about the super-secretive, skunk works project 2 you're working on? Still going with the same MH bulb and reflector?

btw, Thanks for the props on your website!

[cowanrg]

lookin good! wish i could do graphics :-(

my new site will be rolling out in the next couple days, almost double content, and all new look. i will DEFINATELY have a link to you.

nice job man.

Originally posted by Marklar
Well I built my new site its starting to come togather real nice check back often I will be starting projector #2 soon. hommie.net

[Undream]

You guys are going to laugh at me.

Last week on Tuesday, I got shipment of a 400W MH bulb. 40k lumens, etc. It was going to be my final bulb for the project. Well, I opened it up at work a couple of times, checked it out a bit. When I was driving home from work, my wife called me on the cell and told me to go to her moms, because thats where she was. So, I did, and I took the bulb into their house so I could show my father-in-law. Hes been real interested in my projector. Anyways, after we were done visiting, I packed it up and went home. I threw the box in our kitchen, and forgot about it until the next day. The next day, Wednesday, was junk night. With all the chores I was doing and everything, it totally slipped my mind that I had never unpacked the bulb from the box. And, surely enough..

I THREW AWAY MY MS400/HOR METAL HALIDE BULB!!!!!!!!

I didnt realize what I had done until Friday evening. Searching all over the house for a bulb that wasn't here.

/me cries.


Anyways, heres latest pics.

my solution to mounting the lens:
\
what it came out like (it will work great)


latest pics of the box - main box is completed, so, I just have to build the front moveable lens assembly! Also, notice the hinges. Any guest will surely say "DUDE! CAN I LOOK INSIDE!"

this one, I was holding up the lens in the approximate position

[MikeZupcak]

Im thinking of building a video projector but using a 7" 16:9 aspect ratio LCD. I had an idea for a light source: a 1,000,000 candlepower spotlight. This is the LCD i was considering:

http://shop.store.yahoo.com/besttoys2/tm7001s.html

The spotlight seems like it should be bright enough. If anyone has seen Zark5150's original projector i was thinking of one along those lines, with the light behind the dismantled screen. I am also wondering how many lenses i will need and where i can find a barrel lense. Would a megafying glass lense inside some sort of PVC tube work? Also, does the lense need to be big enough to fit over the entire LCD module?

Thanks for your help good luck to everyone!


-Mike

Mikez871414@yahoo.com