Hi everyone, my name is Mike and I am currently a freshman in college. I found out about DIY lcd projectors a few months ago and have become very excited about doing one, I even have a plain up for review in another post. Currently I plain do doing a projector during the summer months, but this winter, to wet my appetite, i got one of those $5 page magnifiers, flipped the leads to the yoke on the back of an old 13" TV and set up my little toy projector. I must admit that i did this mostly because I was board that day. However, the results somewhat interested me, as i expected the image was dark, and only watch able in blacked out room, but when that was so, the picture was bright and quite watch able. What got my attention was the fact that it seems that optics were the main source of where the quality of the picture went down-hill. Yes I know that a page-magnifier is not exactly quality optics, but it seemed to me that if I could get a real piece of glass, the picture in a dark room would be quite watch able. Also, with 14 and 15-inch monitors dirt cheap these days, if one could figure out how to project multiple projectors and converge them, they would be able to increase the brightness several fold. I remember seeing a real crt, and it did not seem that much brighter then a normal direct-view one. I am wondering if anyone has taken a good look at making a high quality projection system for a crt. (Not that ebay fresnel crap) and if with quite bright crts these days if it is something worth doing.
Hey, I do actually think that crt's are a good choice. I use a 25" tv wiht a fresnel lens and the picture is 180" diagonal from corner to corner. I managed to tweak the tv so that the picture is actually watchable even in a dimly lit room. I believe that crt's are actually one of the best ways to project images. I did the exact same method of picture reversal using the yoke wires.
Duo,
Your brightness/contrast modification is a bad idea and is quite likely exposing you to unsafe levels of X-ray emissions. These parameters should never be altered from their factory set condition as they are designed for optimal performance without posing a significant health risk. Also, any modifications done to a TV set should be done with extreme care as lethal voltages are often present on the chassis. You have also failed to post a suitable warning.
Your brightness/contrast modification is a bad idea and is quite likely exposing you to unsafe levels of X-ray emissions. These parameters should never be altered from their factory set condition as they are designed for optimal performance without posing a significant health risk. Also, any modifications done to a TV set should be done with extreme care as lethal voltages are often present on the chassis. You have also failed to post a suitable warning.
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