Loc: Florida, USA
Hello once again. Today I was given a few flat bed scanners. Sadly some of them don't work or are missing cables. A idea hit me. Why not take the light bulbs and a CRT monitor and some projector lenes and build a projector that can be cooled down easyly and any CRT that has a true flat tube can work. Like have two bulbs on the sides and the projector table over and then a projector lens? Think this will work or not?
The lcd/overhead idea would be the brightest solution. The overhead is designed for that purpose. Its easy to find deal lcds on ebay as people sell ones with dead back lighting for next to nothing. Overheads are cheap too. The key though is too keep it all cool. The overhead cools itself, but the lcd needs cooling too. A small fan does the trick just fine. I have never done this but read about it and it seems like a great solution for those with low bucks and big screen needs. -maestro
You can't amplify the light emitted from a CRT via any external means -- at least not and retain the contrast and color. Since CRTs in general are pretty bright you can focus the image onto a larger surface and in a very dark room still have a reasonable, but larger picture.
Likewise there are many options to build an LCD projector from an LCD panel and bright light source. The light needs to be a certain color (temp in K) and the associated focusing and cooling put in place -- the cooling is usually complicated by the fact that the area where the bulb sits needs to be sealed so that no light escapes into the room.
Of course you can buy a reasonable LCD or DLP projector for $500-800, so at some point you have to weigh the effort, parts costs, and potential for failure...One of the main complaints about commercial projectors is the bulb cost and life. Generally they range today from 1000-4000 hours of life for $150-800. It's not uncommon for a $1000 projector to have a $400 bulb.
What I think would be an interesting hack would be to attempt to make a replacement bulb from a couple of Luxeon or other 'pure white' LEDs. Even if one spent $150 on LEDs, you now have a bulb that would last 10000+ hours, and you could reduce/eliminate the fans and high-voltage power supply. Of course, getting enough lumens, focused correctly and with the appropriate light color would be a challenge. Still, used bulb-less projectors can be picked up pretty cheaply.
Essentially the CRT idea wont work with the light bulbs as you would wash out the CRT image. If you want to go that route just put a large fresnel lens (essentially what a page magnifier is, with lots of concentric circles) in front of your TV or CRT and focus that image through a projection lens. (I never did that, so I may be wrong, but I think thats the gist of it) The problem with that though is that it really isn't all that bright. Some people have been quite happy with it, but when you can build an OHP LCD setup for under $100 if you shop around it's not really worth it.
I've actually had a home built projector, using an LCD for over a year now though and I love it. $5 halogen bulbs (color temp is a tad yellow, but that can be adjusted for), instant on and off, fully upgradable. Its a fun project that I highly suggest to anyone here. I would do a mod guide for it here, but it's not exactly mac related, and there are plenty of sites you can go to that will give you the general overview.
Loc: Florida, USA
Well I went to discount auto parts and bought a set of car headlight bulbs that people use in their ricers for the ultra bright white lights. Ran me 20 bucks for the two and I am wiring it up as we speak. I think this will do fine.
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