New design glass and mirror ???

[v1d9uy]

hehe thank you

[my1423]

Getting back to my thread,

I found some nice things at a local repair shop.
They had loads of old crt projection tvs!

They were trashing several that were beyond economic repair. I found out that about 50 percent of all projection tvs use a front side mirror. The rest just a high quality regular mirror. They gave me one for free for they were just going to trash it too. Its 3 feet by 2 1/2 feet. Plenty big enough to cut to whatever size you need. Take a look at your local shop. They also have loads of free lens triplets off the crt tubes!!!

Also i have got another question for mkl2.

First off sorry for totally missing what that you were saying about the parabolic reflector. When i read that i went in the wrong direction thinking that you meant that it focused instead of putting out parallel beam. Brain toot! Might be a good use for the psone lcd guys.

Have you ever tried the lens triplets off of any projection tv instead of the very popular 80 mm? They are veriable focal. I would think that with the use of one you could really up your brightness. Use your paper method to also find the distance where you get the largest possible size immage to the back of your lens triplet and use the built in focus instead of moving the triplet from that spot. More area for contact with the lens = more light through the lens and = more brightness.
I found one for an old sony crt projector that is 6 5/8 inches or 165 mms. BBBIIIGGG!!!!

[mkl2]

First things first; I forgot to reply to your last question about the keystoning thingy. No, there is no knob on the other side of the PJ case. There are just that, a wood piece and two screws, no spring washer, just a silicone one. And it’s a good reason for that. In one year since I build my PJ, I adjusted the keystoning just two times. No need for a knob to do that. Also it’s one axis only.

Second; CRT lenses are designed to be very close to the image source because the light spreads in all directions from the CRT tube. That is opposite to an LCD system where the light is collimated. That’s why hey are so big too.
That’s not going to work with a 15in LCD and to twist the knife even further, I think that the RPTV lens’s throw is really short. Still, the free front surface mirror it’s a nice find.
But you are right, bigger is better, so maybe you should try a 22’’EFL lens coupled with LL’s 650mm FL fresnel.

[ramkishan]

I get lot of mails with queries and appreciations. Accordingly the page is updated. Thus it gets richer day by day. It has been found quite useful particularly for the newcomers. The most important aspects is on the spot adjustments of various elements during actual operation. This is necessitated as most of the DIY entrepreneurs get different parts from different sources. Further the placement of the projector in centre of the room results in awkward utilisation of the space. We have given only few pictures and the write up gives most essential details.

[my1423]

mkl2

Thanks a bundle for your help. Lots of great ideas. Its nice to see actual pictures of the insides. I finally have everything to start construction. I hope to have it going by next week. I will post pics when its done.



As for ramkishan

Why dont you read the threads you post in?
Maybe you are just using this resourse sight for your own benifit! Shameless advertising of your legal firm!!!
Or have you sold the links on your site soo every hit you get paid for.
Either way shame on you!!!

Maybe you should keep to your own thread and on this great add site of yours post some useful pics and dimensions of your build. Rather than just a list of parts. If you had full mesurements maybe you would have less emails!

Why am I even bothering! You wont read this anyway!

[ramkishan]

There is no intention except to apprise the DIY entrpreneurs with a new dimension of built-in provision for adjustment of different components during actual operation so that the end result that is qualilty of image on the screen is achieved easily. It is just for brevity and to conserve space of the forum, we refer to our web page. Our legal work has no relevance with DIY community and few more hits on the web page does not add anything to the ranking of the site in the legal categories.

[eelai]

ram kisham, you are a regular spammer. you offer no advice whatsoever, but you post on every thread.

We started with an OHP and then modified to long throw lens to position the projector at ceiling height. The details are available at the following link to our web page: -

i'm not sure you are selling anything, but it certainly sounds like a sales pitch. maybe you get paid $.08 everytime someone visits your page or maybe it's not even your page and you get paid $.08 everytime you advertise the page. whatever. a legitimate question was asked. do you have a legitimate response? can you help this person with their problem? if not, you need to stay out.

It is just for brevity and to conserve space of the forum

to conserve the space of the forum? how about not spamming? i suggest that not saying anything at all is the best way to go. remember, you are a guest here. please. you are beginning to wear out your welcome.

[Mikey p]

Originally posted by eelai
ram kisham, you are a regular spammer. you offer no advice whatsoever, but you post on every thread........
............remember, you are a guest here. please. you are beginning to wear out your welcome.

AGREED!!!!!!!!!!!!!!!!!!!!!!!!!

[ramkishan]

Comments are being made without understanding or going into depth. We have narrated our experience and emphasized the need and necessity of provision of adjustments for different components. The highlight of our innovative design is that such adjustments are possible from the front during operation of the projector. Such aspects of the design are appreciated even by experts of the DIY projectors. Please go through our web page in entirity and then make any comments. If you are not interested in understanding these aspects, it is upto you.