diy projector using an ohp

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DIY Projector using an OHP http://www.instructables.com/id/DIY-Projector-using-an-OHP/

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This is another projector i made about 2 years ago, but i still have fullyworking.

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

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

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9 of 16 7/1/2014 12:10 PM

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Next » (http://www.instructables.com/id/DIY-Projector-using-an-OHP/?&sort=ACTIVE&limit=40&offset=40#DISCUSS)

rhelwig1 (/member/rhelwig1/)

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

newtonn2 (/member/newtonn2/) (author) rhelwig1

Hi there,That is very strange. Is thereanything magnetic on the topof the OHP? Did you get areading of the temperature onthe top of the OHP?Send some pictures if youcan.

rhelwig1 (/member/rhelwig1/) newtonn2

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

abenavente (/member/abenavente/)

hey mate i habe a viewsonic 506d and i dont think its really necesary to use afresnel lent what do you think? pleace anser to me. Pd: mi data is not working itjust shutdown a few seconds after turn on

newtonn2 (/member/newtonn2/) (author) abenavente

Hi there, I don't understand.What are you trying to do?

vushan (/member/vushan/)

hello. i don't have the fresnel lens. can i make it without it? plzzz reply..or do i usea high power CFL bulb

BASIT 99 (/member/BASIT+99/)

is it necessary to remove backlighti m making onebut i am unable to remove backlightplzzzzzzzzz reply fast

newtonn2 (/member/newtonn2/) (author) BASIT 99

Try without remobimg it first and see if light goes thru

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ABDUL BASIT 89 (/member/ABDUL+BASIT+89/)

is it important to take out backlight fromlcd?answer quicki m hanged

alexr15 (/member/alexr15/)

hi i dont get one thing.

so first light source then condenser lens then fresnel lens then lcd and finallyohp lens (i wont be using a mirror) -- is it the right order or i am missingsomenthing --. hope you will answer

newtonn2 (/member/newtonn2/) (author) alexr15

Yes, thats the way it goes.

newtonn2 (/member/newtonn2/) (author) alexr15

Hi there. The fresnel lens isfrom the ohp, both of them. TheOHP has two lenses together,you could keep them togetherand place them just b4 theLCD, that wont let you adjustthe keystoning. If you separatethem and place one after theLCD and make it able to till, youwill be able to adjustkeystoning.

cd isp (/member/cd+isp/) newtonn2

can i attach lcd and OHP fresnel lens,and then they are connected to aholder,so that lcd and fresnel lens will move.will this help in adjusting keystoning effect.

newtonn2 (/member/newtonn2/) (author) cd isp

To adjust the keystoning youwill need to fix the lcd andconnect the fresnel in a wayyou can tilt it

alexr15 (/member/alexr15/) newtonn2

well thats my problem cause i dont have an ohp. i bought a very stronglight source( oh and do i still need an condenser lens since my halogenlamp comes with reflector and some sort of plastic in front, probably withthe same effect of a condenser lens??) , i have an ohp lens (triplet) and7" lcd , but no fresnel lens. and the only one i found to buy are not ohplens but simple one also called magnifying glass . is this good?

ElvenChild (/member/ElvenChild/)

Hello, would you mind disclosing the dimensions of the enclosure?Thankyou for your time, bye!

maxpower49 (/member/maxpower49/)

one more question what order dose everything go as far as the lcd panel frenel




11 of 16 7/1/2014 12:10 PM

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3 years ago Reply (CSMIPJMGD2JC6SL)

lens and the glass

maxpower49 (/member/maxpower49/)

ummm instructables took out the annoitations you had on each slide

newtonn2 (/member/newtonn2/) (author) maxpower49

Ohh nooo. I try to edit thesideshow to see if I could fix itthere. But all the commentsseams to have desapaired.

maxpower49 (/member/maxpower49/) newtonn2

it's alright.. lol as soons as i geteverything i need to make thisproject another problemappears

Abhineo (/member/Abhineo/)

Hi Newtonn. First i would like to give you thanks for sharing you knowledge in theworld and i impressed with your projects. However i have some minor doubts oncreating my own projector. Appriciate if you could clear those. I bought a Appoloodyssy 11000 OHP from US through one friend, but in india it requires 50$ (2000rs /-) voltage converter to operate. I took converter from one friend and it didn'tbooted 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 somealternatives, but want your opinion please. * I could replace the PCB and the bulbby indian voltage (230 V) operated MH 400 Watt buld, that is not costing me morethan 50$ here including ballast with inbuilt capcitors. so that would run in indianvoltage without converter. But i have doubt on running its 2 fans that look likeCPU fans but couldn't get volt / power rating on it. Please provide me yourthoughts. * Due to its portable design, i am thinking to use its own cabinet forLCD 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 inside the cabinet. Please provide me length width in inches for cutting the fresnalmirror 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 LCDscreen http://cgi.ebay.in/ws/eBayISAPI.dll?ViewItem&item=120610726143&fromMakeTrack=true Spec - Item Description TFT Active Matrix Mobile LCDMonitor Built-In Dome Light Use 7" TFT LCD display panel Super High qualityPicture High Resolution Display Wide viewing angle: 120 °horizontal 100°verticalNTSC/PAL Auto Switchable Full function remote Power consumption: 8W Powersupply: 12V DC * - I have doubt on using condenser lens, the projector have notany, where i could get and what type? I am very sorry to asking may be veryminor things but i am a newby here so please assist. Thanks, Abhishek

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newtonn2 (/member/newtonn2/) (author) Abhineo




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4 years ago Reply (C7XYARLG9GQH2DN)

Sorry for a verylate answer.Beforeanything... Doyou still needsome help withthe projector?

ashhroxy (/member/ashhroxy/)

Hello! Newton. Your projector is impressive. Could you possibly tell me the weightand dimension of your projector

Abhineo (/member/Abhineo/)

Also, Have you used any uv/ir filter? i heard projection get awesome results byusing this? It is very costly to get so want to confirm that before buying?

raun123a (/member/raun123a/)

did u use a ballast didnt see ne could u give me a quick tip as to how use one

mackintoshlinessless (/member/mackintoshlinessless/)

hi newtonn just quickly but what is thediameter of your triplet lens and themagnification if you know that too. thankyou :)

newtonn2 (/member/newtonn2/) (author) mackintoshlinessless

I'm not too sure. I think thefocal length is about 300mm. It came out of an OHP,maybe you could use the lensfrom the OHP you got.

mackintoshlinessless (/member/mackintoshlinessless/) newtonn2

sorry i dont really understandwhat focal length is but is thelens say more than an inch?by the way is a resolution of800 by 600 enough for a goodviewing experience?

hantly (/member/hantly/)

hi therei could realy do with some help i have dismantled my ohp!! the transformer hasseven outputs and one of then doesnt have any wires but that is not the point itsjust that it ways a tonne. that means the projector will do. i mean does yours andif not i dont think i need all the outputs is there a lighter one i could use? i cantsay the voltage really. the brown wire says 240V and the blue one common!

newtonn2 (/member/newtonn2/) (author) hantly

Sorry for really late answer.

Mine is really heavy too. Thereis another way to do with isbuying an electronictransformer. But they are sooooexpensive, it makes the projectnot worthy any more if you haveto buy it.




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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 theonly problem is that i cant find ohp'sanywhere not even on ebay (80dollars+ ). BTW how did you cut thefrezel lens out becuse it wont load thatpicture. Also how big is the dimentionsof your lcd screen and cut out lens.thank you


I don't remember the side ofthe fresnel lens once is cut. cutit a bit bigger than the LCD. Alldepends on how you are goingto 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=item335c927c78thankyou, btw where else can you bya a triplet lens from?


Hi, sorry for late reply.

The LCD is not bad, but youcould probably find one withbetter resolution.

noik (/member/noik/)

Best projector I've seen on instructables.

newtonn2 (/member/newtonn2/) (author) noik

Thank you! Did you see myother projector using a LED aslight source.

See here(http://www.instructables.com/id/DIY-Multimedia-LED-Projector/)

noik (/member/noik/) newtonn2

Yes, I saw, I'm going to make one to:)


struggleing to find a cheap OHP???? ask the teachers at the wood, metal worksbecause usually the school asks them to repair them but i asked and got two for




14 of 16 7/1/2014 12:10 PM

4 years ago Reply (CUG47X7G962DLKR)


(/member/matthewkhoury75/)

4 years ago Reply (CKUHNPLG7DYOVU5)

(/member/newtonn2/)

4 years ago Reply (CE8OOM5G7DYP0EC)

Make Comment

free. all that was wrong isthat both bulbs hadblown. good luck

matthewkhoury75 (/member/matthewkhoury75/)

hey newtonn, its me again. on my smallprojector, I have wired everything up to thelaptop charger and the switch and it allworks. I am putting everything in the boxand was wondering were you got the screwin this picture http://www.instructables.com/file/F4MDADPFRXWGXGF(http://www.instructables.com/file/F4MDADPFRXWGXGF) from? I needsomething like this and was wondering ifyou know were i can get one? I have a cddrive but dont know were it may be in it?Please reply asap.

thanks in advance

newtonn2 (/member/newtonn2/) (author) matthewkhoury75

Hi there Matthew, nice to hearfrom you. I'm glad you haveyour projector almost there.

Could you please let me knowwhat part of the screw youneed?. As I made thecomponents that the screw isholding.

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