Instructables
Picture of DIY Projector using an OHP
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This is another projector i made about 2 years ago, but i still have fully working.

I don't have a lot of time to tell you what to do step by step, and my English is really bad, but i have lots of pictures that may help anybody who want to make one of this cheap (under 50 UK Pounds)

If you have any question... Just ask, I'll be glad to help.
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rhelwig15 months ago

Hi all, don't know if anybody can help but I started working on one of these projectors recently. I took an LCD from a broken motherboard and got a driver off ebay. I plug in a video source and the picture comes on. Problem is as soon as I move the screen over top of the over head projector the video goes blank. if I put just a part of the screen over the OHP just that section goes out. The video wont come back until I turn the LCD off and then back on. Anyone have any idea as to why a light source could stop the screen from working?

newtonn2 (author)  rhelwig15 months ago
Hi there,
That is very strange. Is there anything magnetic on the top of the OHP? Did you get a reading of the temperature on the top of the OHP?
Send some pictures if you can.
rhelwig1 newtonn25 months ago

I dont think it can be from the heat because it happens even when I've just turned the OHP on, before any heat can build. I don't think there is anything magetic in the projector.

abenavente7 months ago
hey mate i habe a viewsonic 506d and i dont think its really necesary to use a fresnel lent what do you think? pleace anser to me. Pd: mi data is not working it just shutdown a few seconds after turn on
newtonn2 (author)  abenavente7 months ago
Hi there, I don't understand. What are you trying to do?
vushan9 months ago
hello. i don't have the fresnel lens. can i make it without it? plzzz reply..or do i use a high power CFL bulb
BASIT 991 year ago
is it necessary to remove backlight
i m making one
but i am unable to remove backlight
plzzzzzzzzz reply fast
newtonn2 (author)  BASIT 991 year ago
Try without remobimg it first and see if light goes thru
is it important to take out backlight from lcd?
answer quick
i m hanged
alexr154 years ago
 hi i dont get one thing.

 so first light source then condenser lens  then fresnel lens  then lcd and finally ohp lens (i wont be using a mirror) -- is it the right order or i am missing somenthing  --. hope you will answer
newtonn2 (author)  alexr152 years ago
Yes, thats the way it goes.
newtonn2 (author)  alexr154 years ago
Hi there. The fresnel lens is from the ohp, both of them. The OHP has two lenses together, you could keep them together and place them just b4 the LCD, that wont let you adjust the keystoning. If you separate them and place one after the LCD and make it able to till, you will be able to adjust keystoning.
cd isp newtonn22 years ago
can i attach lcd and OHP fresnel lens,and then they are connected to a holder,so that lcd and fresnel lens will move.will this help in adjusting key stoning effect.
newtonn2 (author)  cd isp2 years ago
To adjust the keystoning you will need to fix the lcd and connect the fresnel in a way you can tilt it
 well thats my problem cause i dont have an ohp. i bought a very strong light source( oh and do i still need an condenser lens since my halogen lamp comes with reflector and some sort of plastic in front, probably with the same effect of a condenser lens??)   , i have an  ohp lens (triplet) and 7" lcd , but no fresnel lens. and the only one i found to buy are not ohp lens but simple one also called magnifying glass . is this good?
ElvenChild3 years ago
Hello, would you mind disclosing the dimensions of the enclosure? Thankyou for your time, bye!
maxpower493 years ago
one more question what order dose everything go as far as the lcd panel frenel lens and the glass
maxpower493 years ago
ummm instructables took out the annoitations you had on each slide
newtonn2 (author)  maxpower493 years ago
Ohh nooo. I try to edit the sideshow to see if I could fix it there. But all the comments seams to have desapaired.
it's alright.. lol as soons as i get everything i need to make this project another problem appears
Abhineo4 years ago
Hi Newtonn. First i would like to give you thanks for sharing you knowledge in the world and i impressed with your projects. However i have some minor doubts on creating my own projector. Appriciate if you could clear those. I bought a Appolo odyssy 11000 OHP from US through one friend, but in india it requires 50$ (2000 rs /-) voltage converter to operate. I took converter from one friend and it didn't booted up. its bulb power is 410w/82 V. Looks like some problem is in its PCB. however replacing the production and getting back another i thought of some alternatives, but want your opinion please. * I could replace the PCB and the bulb by indian voltage (230 V) operated MH 400 Watt buld, that is not costing me more than 50$ here including ballast with inbuilt capcitors. so that would run in indian voltage without converter. But i have doubt on running its 2 fans that look like CPU fans but couldn't get volt / power rating on it. Please provide me your thoughts. * Due to its portable design, i am thinking to use its own cabinet for LCD projector by using 7" car lcd dvd player. i have attached the pics of projector, but can you please give me a rough diagram for placing lenses LCD mirrors in side the cabinet. Please provide me length width in inches for cutting the fresnal mirror and glasses for best outcome. here is specifications of projector. http://www.mmvideosystems.com/video_equipment_rental/equipment_detail/apollo_11000_odyssey.html And i am going to use 600x480resolution below LCD screen http://cgi.ebay.in/ws/eBayISAPI.dll?ViewItem&item=120610726143&fromMakeTrack=true Spec - Item Description TFT Active Matrix Mobile LCD Monitor Built-In Dome Light Use 7" TFT LCD display panel Super High quality Picture High Resolution Display Wide viewing angle: 120 °horizontal 100°vertical NTSC/PAL Auto Switchable Full function remote Power consumption: 8W Power supply: 12V DC * - I have doubt on using condenser lens, the projector have not any, where i could get and what type? I am very sorry to asking may be very minor things but i am a newby here so please assist. Thanks, Abhishek
carvideo7inch.jpgapollo_11000-multi.jpg
newtonn2 (author)  Abhineo3 years ago
Sorry for a very late answer. Before anything... Do you still need some help with the projector?
ashhroxy3 years ago
Hello! Newton. Your projector is impressive. Could you possibly tell me the weight and dimension of your projector
Abhineo4 years ago
Also, Have you used any uv/ir filter? i heard projection get awesome results by using this? It is very costly to get so want to confirm that before buying?
raun123a4 years ago
did u use a ballast didnt see ne could u give me a quick tip as to how use one
hi newtonn just quickly but what is the diameter of your triplet lens and the magnification if you know that too. thank you :)
newtonn2 (author)  mackintoshlinessless4 years ago
 I'm not too sure. I think the focal length is about 300mm.  It came out of an OHP, maybe you could use the lens from the OHP you got.
sorry i dont really understand what focal length is but is the lens say more than an inch? by the way is a resolution of 800 by 600 enough for a good viewing experience?
hantly4 years ago
 hi there 
i could realy do with some help i have dismantled my ohp!! the transformer has seven outputs and one of then doesnt have any wires but that is not the point its just that it ways a tonne. that means the projector will do. i mean does yours and if not i dont think i need all the outputs is there a lighter one i could use? i cant say the voltage really. the brown wire says 240V and the blue one common! 
newtonn2 (author)  hantly4 years ago
 
Sorry for really late answer.

Mine is really heavy too. There is another way to do with is buying an electronic transformer. But they are soooo expensive, it makes the project not worthy any more if you have to buy it.

Mine is heavy, but I didn't need to move if front it's place so once is fitted, you don't worry about the weight any more.
i cant wait to build one of these but the only problem is that i cant find ohp's anywhere not even on ebay (80 dollars+ ). BTW how did you cut the frezel lens out becuse it wont load that picture. Also how big is the dimentions of your lcd screen and cut out lens. thank you

newtonn2 (author)  mackintoshlinessless4 years ago
 I don't remember the side of the fresnel lens once is cut. cut it a bit bigger than the LCD. All depends on how you are going to fit them.
is this a good monitor to use:
http://cgi.ebay.com.au/A47-New-7-Inches-Headrest-LCD-IR-screen-IR-Car-DVD-TV-/220596436088?cmd=ViewItem&pt=AU_Car_Parts_Accessories&hash=item335c927c78
thankyou, btw where else can you by a a triplet lens from?
newtonn2 (author)  mackintoshlinessless4 years ago
 Hi, sorry for late reply.

The LCD is not bad, but you could probably find one with better resolution.
noik4 years ago
 Best projector I've seen on instructables.
newtonn2 (author)  noik4 years ago
 Thank you!  Did you see my other projector using a LED as light source. 

See here

noik newtonn24 years ago
 Yes, I saw, I'm going to make one to:)
struggleing to find a cheap OHP???? ask the teachers at the wood, metal works because usually the school asks them to repair them but i asked and got two for free. all that was wrong is that both bulbs had blown. good luck
hey newtonn, its me again. on my small projector, I have wired everything up to the laptop charger and the switch and it all works.  I am putting everything in the box and was wondering were you got the screw in this picture http://www.instructables.com/file/F4MDADPFRXWGXGF from? I need something like this and was wondering if you know were i can get one? I have a cd drive but dont know were it may be in it? Please reply asap.

thanks in advance

newtonn2 (author)  matthewkhoury754 years ago
 Hi there Matthew, nice to hear from you.  I'm glad you have your projector almost there.

Could you please let me know what part of the screw you need?. As I made the components that the screw is holding. 
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