Hello newbie here.
1. Yes, I have spent 4 days reading the message archives before posting this. There was a sticky on what LCD monitors to strip, but I didn;t see anything similar for the OHPs.
I am going to start my first DIY projector project and am going to go on the cheap. The inspiration was the tomshardware article. Being the first one, I am going simple/low cost with an LCD monitor/OHP.
2. What should I look for in the OHP? I plan on ebaying it. I noticed most have a platform oh only 10.5x10.5. Are there larger ones, such that a full 15" monitor can be used, or are 90% of them 10.5x10.5?
3. Are the any "common mods" that get made to stock OHPs? such as brighter bulbs?
4. Any pictures/plans to point to for making a simle keystone correction to the design?
Thanks!
Spektre
1. Yes, I have spent 4 days reading the message archives before posting this. There was a sticky on what LCD monitors to strip, but I didn;t see anything similar for the OHPs.
I am going to start my first DIY projector project and am going to go on the cheap. The inspiration was the tomshardware article. Being the first one, I am going simple/low cost with an LCD monitor/OHP.
2. What should I look for in the OHP? I plan on ebaying it. I noticed most have a platform oh only 10.5x10.5. Are there larger ones, such that a full 15" monitor can be used, or are 90% of them 10.5x10.5?
3. Are the any "common mods" that get made to stock OHPs? such as brighter bulbs?
4. Any pictures/plans to point to for making a simle keystone correction to the design?
Thanks!
Spektre
Well, no replies to the past post, so I'll try something new.
One of the supposed benefits to the DIY is longer bulb life and cheaper bulbs.
THe cheaper part I get, but I am looking at a 3M 9800 projector to base my set around and it appears its bulb life is 50 hours! How is that longer?
One of the supposed benefits to the DIY is longer bulb life and cheaper bulbs.
THe cheaper part I get, but I am looking at a 3M 9800 projector to base my set around and it appears its bulb life is 50 hours! How is that longer?
As for the OHPs im not sure myself as i have no idea how people get past the corners being covered.
With the bulbs, if u want a long life one (eg 10,000hrs +) ull need to get a metal halide lamp + ballast (power supply/control) + base for the lamp to fit into (a socket).
These items cost around $100US all up, unfortunatly for me I live in AUS so it is gona cost me more 😛.
With the bulbs, if u want a long life one (eg 10,000hrs +) ull need to get a metal halide lamp + ballast (power supply/control) + base for the lamp to fit into (a socket).
These items cost around $100US all up, unfortunatly for me I live in AUS so it is gona cost me more 😛.
Basically any OHP will work, but there are a few features that you can look for.
Triplet lenses will give a bit sharper image than a standard doublet.
As far as different bulbs go, most either use a 360W or the 410W. The lower wattage bulbs last a bit longer at about 75-100hrs, and the 400W and up usually being 50hrs. You can get long life versions of most af the common bulbs, usually denoted by the -5 suffix ( such as ENX-5) that will last up to three times longer than the standard bulbs.
If the corners of the stage really bother you, you can use Powerstrip to slightly reduce the size of the image on the lcd, then it will fit on the ohp just fine. Video will look just fine slightly compressed like this but text will be compromised.
Keystone correction is as simple as propping one side of the lcd up with something.
For your last question, you do get cheaper bulbs that last longer if you go with a DIY Metal Halide setup. Setting an LCD on top of an ohp isn't really DIY, because you haven't built anything. But using the optics from an ohp and coupling them with a MH light source in a custom built enclosure, That's DIY!
Triplet lenses will give a bit sharper image than a standard doublet.
As far as different bulbs go, most either use a 360W or the 410W. The lower wattage bulbs last a bit longer at about 75-100hrs, and the 400W and up usually being 50hrs. You can get long life versions of most af the common bulbs, usually denoted by the -5 suffix ( such as ENX-5) that will last up to three times longer than the standard bulbs.
If the corners of the stage really bother you, you can use Powerstrip to slightly reduce the size of the image on the lcd, then it will fit on the ohp just fine. Video will look just fine slightly compressed like this but text will be compromised.
Keystone correction is as simple as propping one side of the lcd up with something.
For your last question, you do get cheaper bulbs that last longer if you go with a DIY Metal Halide setup. Setting an LCD on top of an ohp isn't really DIY, because you haven't built anything. But using the optics from an ohp and coupling them with a MH light source in a custom built enclosure, That's DIY!
If u read my thread here: http://www.diyaudio.com/forums/showthread.php?s=&threadid=64859 it will answer most of ur Qs i believe as I have come across many of the probs u will, and found answers to them with others help.
As for what makes a "DIY projector"...id say taking apart an LCD monitor, and stripping the insides of an OHP and replacing them and then putting them all together to make a projector is classed as "DIY" 😛. The degree may be different, but when u make a box unit, do u cut down the trees to make the wood? 😛
As for what makes a "DIY projector"...id say taking apart an LCD monitor, and stripping the insides of an OHP and replacing them and then putting them all together to make a projector is classed as "DIY" 😛. The degree may be different, but when u make a box unit, do u cut down the trees to make the wood? 😛
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