ok, I've decided to waste some time this winter break (college student) building a cheap excuse for a projector, and decided on the OHP variety.
I actually found both this forum and lumen lab before seeing the tom's article but the tom's article made the OHP version of the projectors seem like a pretty good road to go down (since it seemed so much easier after seeing their version).
So, I plan to build it using the following:
Samsung 512N 15" screen since it has that 12ms response time and a good contrast ratio
Dukane projector of some sort (whatever comes by cheap) since most of these seem to be triplex lenses.
Now my question is:
Can I build a box for this to contain the light? I don't really want the light going all over the place, it gives it a shoddy look. I'm thinking a blacked out box, with ventilation (with carbon filters over the vent system to damp out light leakage too, or even some kinda light blocking vent system.
It doesn't seem like it could be that hard to even line up a fan and tube it to the vents of the projector?
Anybody do this before? I noticed a lot of people ripped apart pieces of a projector and put them in such boxes but nobody seems to have just cased an existing one. To be honest I live in NYC and have no real garage, nor do I care to injure myself building the projector so keeping it super simple would be great.
I actually found both this forum and lumen lab before seeing the tom's article but the tom's article made the OHP version of the projectors seem like a pretty good road to go down (since it seemed so much easier after seeing their version).
So, I plan to build it using the following:
Samsung 512N 15" screen since it has that 12ms response time and a good contrast ratio
Dukane projector of some sort (whatever comes by cheap) since most of these seem to be triplex lenses.
Now my question is:
Can I build a box for this to contain the light? I don't really want the light going all over the place, it gives it a shoddy look. I'm thinking a blacked out box, with ventilation (with carbon filters over the vent system to damp out light leakage too, or even some kinda light blocking vent system.
It doesn't seem like it could be that hard to even line up a fan and tube it to the vents of the projector?
Anybody do this before? I noticed a lot of people ripped apart pieces of a projector and put them in such boxes but nobody seems to have just cased an existing one. To be honest I live in NYC and have no real garage, nor do I care to injure myself building the projector so keeping it super simple would be great.
You mean sticking the ohp in another enclosure? I'm sure its been done. Another idea is using 4 or 8 long retention springs. With 4, having one attached to each corner of the stage (above the glass and fresnel) and having the other ends attached to the lens arm at the 4 corners...then cover the 4 sides with some sort of black felt or similar, cut at the max length the lens arm can extend to. This'll allow the fabric to not sag too much (possibly getting in the way of the lens' field of view) if you don't extend the lens completely. 8 springs would have the additional 4 mounted at the middle of each side to prevent sagging of the fabric in extreme cases. Its a pretty simple precedure as you'd just need to drill 1 or 2 small holes to mount each spring (depending on spring design) and it'd look a bit better than sticking the entire thing in a big rectangular box. Small bungee cords would work also
If you have it setup and don't plan on adjusting the ohp much, you can wrap fabric around and leave it alone without needing anything to keep the inside clear of obstructions. If you build an enclosure, I'm sure temperatures will rise a few degrees no matter what you try but nothing too severe. Its entirely up to you and how you want it to look.
and on a related note, lcd's on top of stock ohp's have been around for a long while. Where do you think all the projection panels came from? 😉
If you have it setup and don't plan on adjusting the ohp much, you can wrap fabric around and leave it alone without needing anything to keep the inside clear of obstructions. If you build an enclosure, I'm sure temperatures will rise a few degrees no matter what you try but nothing too severe. Its entirely up to you and how you want it to look.
and on a related note, lcd's on top of stock ohp's have been around for a long while. Where do you think all the projection panels came from? 😉
This guy did what you're speaking of but it would require some woodwork just like a full enclosure.
http://rsise.anu.edu.au/~felix/iar/Projects/HomeTheater/index.html
Home Depot will cut the wood for you if you have all the dimensions... it shouldn't cost much if you plan the cuts well. Maybe you could con some high school kids at a high school shop class to build it for you? 😀
http://rsise.anu.edu.au/~felix/iar/Projects/HomeTheater/index.html
Home Depot will cut the wood for you if you have all the dimensions... it shouldn't cost much if you plan the cuts well. Maybe you could con some high school kids at a high school shop class to build it for you? 😀
An externally hosted image should be here but it was not working when we last tested it.
Hi - I'm a NooB and have been kicking this idea around as well. To make a more compact box, I was thinking of building something that's more like the top half of a traditional projector design (with a 45 degree mirror above the lcd and a lens in front) and sitting it on top of the OHP stage. Any thoughts? Can I still utilize the lens from the OHP in this design? If I were to put the lens into a tube, how to best focus it? Thanks
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