Step 1: Parts, tools & links
# Overhead projector - 20~50 Euro
One of the main parts is a overhead projector. You can find these things at schools, secondhand shops and websites like Marktplaats.nl or eBay.
Tips for buying:
1) Look for an brand projector, like 3M
2) Choose one with a high wattage lamp. I used a 250watt lamp, thats in daylight a bit weak, you can better look for an 400watt lamp.
3) A bigger glass plate can hold bigger LCD screens
4) Check the glass plate on damages
# LCD monitor - 25~50 Euro
The second main part is a LCD screen. I used a TFT computer monitor. There are a lot of screen sizes. Look for one that fits on the glass plate of your overhead projector. Bigger works too, but then you will lose some screen edges.
A lot of screens got a short FFC cable, thats called a 'FFC issue'. You need to extend the cable by replace it with a longer cable or extend the FFC cable with a solder iron. The easiest way is to find a screen with no FFC issues.
Tips for buying:
1) Search for one that fits on you overhead projector.
2) TFT computer screens are the easiest way. Laptop screens needs a controller, they are hard to find in Europe.
3) Look for screens with a broken backlight. You don't need that component for this projector.
4) Search on the internet for a type with no FFC issues. You can look in the database of Lumenlab or search with Google "LCD brand + model + ffc issue"
# Wood - 2~5 Euro
For making a frame that will hold the LCD screen.
# FFC cable - 15 Dollar
Only if you have a screen with a FFC issue. You can buy this one at the Lumenlab Store.
# UV & IR filter - 20 Euro
This will help cooling down the screen and prevents the screen is getting yellow.
# 2x Cooling fans - 10 Euro
These will help to keep the LCD screen cool. Simple computer fans, you can get these from old computers or buy it at a local computer shop.
# Gaffer tape - 10 Euro
This tape could be used for screen protection at the wooden frame.
# Aluminum foil - 1 Euro
To improve the light reflection.
# Solder iron
# Iron saw
Please read before you start a lot of information about building a projector. It prevents a lot of problems.
# Information about overhead projectors:
# Information about LCD screens
# Other overhead projector projects:
- http://www.neoweb.nl/tftbeamer/index.html (Dutch)
- http://www.dity.nl/forum/ (Dutch)
- http://gathering.tweakers.net/forum/list_messages/1091930 (Dutch)