i will show you how to make a homemade projector using mostly things you can find around the house. (remember to read the whole thing before you start because i am adding new info at the end as i learn more, im a beginner 2)
Step 1: What You Will Need
you will need a large cardboard box, i used a cornflake box, you need a fresnel lens and a regular magnified glass i found the fresnel lens at a shop advertised as (credit card sized magnifier) for about 5 bucks and the magnified glass should be about 2inches across, you also need a bright light, the brighter the better but led is good because it needs to be cool or else you will cook the lcd i got the lcd from ebay for $28.00 and it allows you to plug anything into it. you will need a round cylender the same width as the magnified glass (i used pringles chip container) the last few things you will need are aluminum foil ,tape and scissors.
i bought that square looking led light of ebay for $20 but i cant use it yet because it needs a heat sink and fan, the other one runs cooler. 12v
Step 2: How to Begin
to begin get your box and cut the top off then about halfway down put a piece of cardboard with the fresnel lens in it and firmly tape it down (see pic) cut out another piece of card board the same width as the box and cut a hole in it for your light the cardboard around the hole should be covered in tin foil to reflect the most light. insert it in your box make sure it is in line with the fresnel lens and should be at least 3inches away from it. (update) i just learnt that if you want to make the picture about 3x brighter you need to put a cone + condenser lens/strong magnified glass on the light (see pic)
Step 3: Make Light Box
now you have your fresnel lens and light lined up you need to cover it to keep the light from escaping. to do this you need to cut out 3 pieces of card board and wrap them in tin foil place them around the light and fresnel lens it should be a tight seal with barely any light escaping except for through the fresnel lens.
Step 4: Attach Magnified Glass
to attach magnified glass, cut the cylinder in half (to about 3-4inches long) both ends should be open tape the magnified glass to one end. cut a hole in the box make sure it lines up with the light and fresnel lens insert it in (lens should be on the outside of the box) to make it more stable you can add another piece of cardboard to hold the cylinder. you can now turn the light on and you should see a shape on the wall push the magnified glass in and out to focus (just put a slide in front of the fresnel lens and you have a slide projector!) if you see the individual leds projected onto the wall and not just a square white light you need to move your fresnel lens farther away from the led.
Step 5: Attach the Lcd
i got this lcd from ebay for 28bucks just type in 2.5 inch lcd reverse monitor or something like that it needs to have the composite input (red yellow white plugs) if it only has the yellow one thats fine. so once you get it unscrew it and be very careful because the lcd is easy to break , take the metal case off the lcd and all the plastic filters until you can see through the screen(it will still be bury to see through) then place it infront of the fresnel lens (it should be upside down and backwards) when your picture is the right way on the wall, tape the screen on and you are done! now just put a lid on the box and stick the cables out the side of it
Step 6: Now You Are Finnished.
you are finnished now
(update) i found a heat sink and installed my 20w led its not that much brighter but i think i can fix that by adjusting the condenser lens on the led and putting a cone shaped thing around it to direct the light here is a picture of the new led. see a video of it in action http://www.youtube.com/watch?v=nnRgI-apRtc
(i have drawn up some plans for a future projector project)