Overhead Projectors for sale eBay

DIY projector | The Disinformatico

December 10, 2005 – 00:00

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Projector DIY


This article comes to you thanks to the kind donations of "bgmailbox", "tartam2002" and "skidonet." Are you thinking of buying a giant TV for Christmas? Think twice, especially if you have considered the possibility of a video projector. I did some investigating on the subject, because I thought I had to fix the house plant, which I use more often (with young children it is difficult to get out to go to the movies, so I resort to the DVD), and I have a very original, low-cost solution to propose.

There are various models of projector, and shopping malls are full: they are very compact and remember the slide projectors. The prices are affordable, especially when compared with those of a plasma or LCD of the same size, and indeed, the projectors are the only real solution if you want a "cinema effect", ie a giant screen (over a meter). However, require to be able to darken the room during the day, and they are not comfortable to use for a zapping improvised, so can not really replace a TV, but the visions-event, such as DVD movies, are unparalleled.

However there is a rip-off: the lamp of the projector does not last long and costs almost as much as half of the projector. It is in short, a situation similar to that of printers: they are cheap, but the ink cartridges and printheads are mind-boggling prices and modest runtimes. The long-term costs of a video projector, in short, are much higher than you might think.

During my research I came across a truly original, as true geeks: build itself a projector better than the ones on the market and spend much, much less.

A video projector, basically, consists of a light source, from a "slide" composed by a small LCD screen which displays the image, and a lens that focuses and projects this image on the screen. To achieve compact size, the projectors use lamps for sale very small and equally tiny screens, which have very high costs. The compact requires focus so much light in a small space inside the projector, and this is difficult and therefore expensive.

But instead of dear miniscreen with minilampada you can use a normal LCD screen of a monitor: just take off the backlight, so that it becomes clear just as a slide, and then place it on an overhead projector. The results are astonishing, and in addition to the satisfaction of build itself a projector is pleased to save a great deal both as initial investment (an overhead projector second hand cheap) and long-term, because of the overhead lamps are much more cheap and durable than those of projectors.

Source: attivissimo.blogspot.com

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There are two kinds of "overhead projectors"

Opaque and transparency.
The opaque is probably what you are thinking of. The ones schools use are quite large boxes (I used one at Theatre/Theater and Bindlestiff Studios to create billboards for productions)
There are smaller ones like the Artograph I got from Pearl that only handle 7x7 inch images.
I haven't been able to find the old-fashioned box-monsters online. All I can find are the modern compacts like the Buhl Mark IV Opus. A thousand dollars! Argh!
Try eBay and Google looking for Opaque Overhead Projector. Your local library may even rent them.
Hope this helps.

Home / Community, News / Citizens get answers on water transfer, Nov. 5 bond ..  — Monitor Online
City staff used an overhead projector to display an analysis of current and projected water bills for the audience to see, and copies of the analysis were distributed to the audience afterwards.

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