DIY Video Projector from an old Overhead Projector 

I bought a fold up 3M overhead projector from goodwill about 5 years ago for $10, and last night I found a Kodak Carousel slide projector in a dumpster and looking to make something with one or both of them. I also bought some binoculars for .50¢ at a garage sale a week ago. What I have in mind is a movie projector, and/or some sort of telephoto lens for my smart phone or a monocular and/or a microscope.. I’ve only taken apart the binoculars and the part that is next to your eye that has 2 lenses, I flipped one around and it makes for a pretty good loupe. I also have another pair of binoculars and an old Pentax EI200 digital camera with a zoom lens that I purchased back in 2001/02’ when digital cameras were still sorta a new thing and expensive. It still works too but all of the things i mentioned are at my disposal. Have a pair of reading glasses too… lmao.

Impressive. For a tech noob like me, this is some serious magic you pulled off here. And thanks for the shout out, mate.

I remember watching my teacher putting the pictures in upside-down and then flipping it. Then looking at the crooked image on the screen while she yelled in the auditorium about stuff I didn't care about. 😁

I made one of these probably 8 or 10 years ago and my setup looked exactly the same as yours. Those boards for the horizontal and vertical were in the way on mine too and the only way to remedy that would be to get another ribbon cable where they plug into each other at the corner so you can lay them out away from the LCD panel. That is a very fine ribbon cable and not too easy to mess with but it could be done. I had a lot of fun with mine but I ended up not keeping it because it was just so bulky to mess with. Would be fun to build one again though.

you could just replace entire power supply with 12v power brick since you dont need backlight inverter anymore

I did this years ago, was always worried about "Death by power supply" as 240V isn't a tickle, I think I put the power supply inside a tupper ware box.. I played killing floor on it, got massive motionn sickness, I had a 10 foot by 10 foot screen. And it was hot enough that I didn't need my heating on, I did prop the LCD part away from the monitor with blocks of wood and a PC fan to blow between the projector top, and the screen itself... This was mid 2000's I think. Good fun

Schönes Video. Ich habe vor über 12 Jahren mal sowas gebaut und hatte auch einen Monitor, der die Platinen so ungünstig rechts und links hatte. Ich habe schlicht die Flachbandkabel entfernt und die Kontaktpunkte mit Adern eines alten IDE-kabels verbunden. Funktionierte einwandfrei. Beim Netzteil hatte ich Glück, bei dem Monitor wars extern. Zum Kühlen des Panels habe ich dies auf eine 5mm Holzleiste gelegt, einige 4cm-Lüfter genommen und den Luftstrom mit einem Stück Pappe unter das Panel geblasen. Eine zweite Lüfterreihe blies über das Panel. Über den Lüftern noch ein Holzrahmen, mit schwarzem Tuch bis zum Objektiv - blokiert alles störende Licht. Überall, wo Luftstrom erforderlich war, noch große Trichter aus Tonpapier gebastelt - blokiert nur das austredende Licht, der Luftstrom wird nicht beeinträchtigt. Leider haben die Birnen keine lange Lebensdauer. Als ich den damaligen Preis der Birnen (15€+Versand) und deren Nutzungsdauer (50h) herausfand, wurde das Projekt eingemottet. Inzwischen bin ich ernsthaft am Überlegen, das Projekt wieder auszugraben und den Overhead auf LED umzurüsten. Deutlich günstiger. Außerdem setze ich OHPs auch ganz exotisch gerne als OHPs ein - es gibt moderneres, aber nichts didaktisch besseres. Powerpoint ist das Gegenteil von interaktiv. Auf Zwischenfragen, auf die man nicht vorbereitet war, auf alternative Denkansätze... auf all das kann man nicht reagieren. Für Fotos und Videos ist hingen Beamer ideal. Man kann damit vorgefertigtes präsentieren. aber leider nichts lehren. Wenn ich was vortrage - immer OHP. Daher ist so ein Aufsatz nicht verkehrt - will man zwischendurch Bilder oder Videos zeigen, legt man den einfach den auf den OHP. Handschriftliche Notizen per Kamera auf Beamer klingt toll - hat meist aber miserable Auflösung. Ab 4k kann es zur Alternative werden. Vorher nicht. Abgesehen davon, dass das Projekterformat die falsche Orientierung hat - hochkant und nach und nach hochscrollen (Folienrolle) und bei Bedarf zurückscrollen ist mit PP nicht drin. Außerdem: Man schreibt an eine Tafel oder auf den OHP in dem Rhytmus, in dem man spricht. Mit PP nicht nachzubilden. Stiftbewegung, Schatten an der Wand - natürlicher Vorgang. Mausklick und was erscheint - Magie=beeindruckend, als es neu war, aber nun nur schlicht unnatürlich. Jeder Unterichtende, der heile OHPs entsorgt, gehört gefeuert - von Didaktik keine Ahnung. Naja, was des einen Leid ist des anderen Freud...

They may have had the projector plugged into a circuit with a lot of things running on it. Every time they turned the projector on it tripped the RCD or blew a fuse. Not because the projector was broken, but because the circuit was already at capacity before the projector was turned on.

Damn, I am looking for one of these years now.

nice, i just find one trow away and bring it home, it be in a Suitcase built, but no light at the bottom, took it with me because I just found the lenses interesting anyway, the light shined from above and looked here how it worked, like your idea with an lcd screen, thank you for your video

hi Jan. coincidentally i found this video where you made this overhead mod. now i made the beginning of the RooBee DLP 3d-printer from instructables. and i wondered if i can build that and leave the (acer) DLP projector away due cost perspective, and put a monitor under the build platform with one or multiple UV led's or lamps under it.perhaps switched or with a shutter or so. then we also should get rid of the UV filter layer in the monitor, (not the polarisation film's) but if this works with a cheap monitor afterall, maybe then we could use an screen with a bit higher resolution to sacrifice. the pros off this is that if it works we got a much bigger build volume then the common Anycubic Photon and all the other comparible DLP 3D-printers. those are also using a simple screen in fact, but way to small in my eyes. perhaps i am goeing to try and strip an old lcd screen with a red stripe true the screen (hopefully the bad stripe does not interfere to much just using the monitor in Black and white as a Gobo, but just for testing puposes who cares) like so and put a UV tanning light under it and see if some Daylight resin will cure. (knowing that the resolution of the crappy monitor is way to low for serious usage) what do you think about this?

I remember those from my school days, back in the 80's

I think the next stage should be is to get rid of that power hungry halogen lamp and replace it with a 50 watt LED. Better light, probably no fan required and most of the heat gone. In fact the box will be almost empty so you could put the power supply and driver board inside, perfect solution. You could probably use the original optical system with little modification.

ha ha I been working on a handmade overhead for my live visual performances like this but with extra bells and whistles!! glad to see I'm not the only one messing with older tech crossing with new parts! I agree with Beeny, but I would also add a mask to baffle the spill light and tape the light leaks if your making improvements, maybe a temapture adjustable 3000lumen WHITE or RGB LED they make ones that get really bright and add an iris to the bulb to control brightness! Once my prototype is done I'll link a video to yah.

Might be a dumb question, but would something like this work by just putting on a movie on your phone and laying it on the projector?

Dude! I have that exact projector and the exact same model philips LCD monitor. Wtf

Can we change the lamp with high power LED?

Itu bekas mesin foto copy ya???

Do you still have this projector and the lcd screen?

Did anyone yet it with LED bulbs instead of hot tungsten bulb

Hola ponele un led driver queda mejor led puro blanco 100 w