How Do You Make A Cheap TV Projector?
A television projector can cast a video image as large as a movie screen. A commercial television projector will cost a few thousand dollars, but you can make one on the cheap. You can take an old tube-based television set and use lenses to magnify its video image. With the help of cardboard and a Fresnel lens, you can give it a projection tube that will cast a projector-size image onto any available wall in your house. Measure the height and width of your television screen within the frame. You want the measurements of the border between the frame and the screen. Cut out a piece of cardboard the same size as the screen. Cut a 17-cm hole in the very center using a drawing compass first to draw the circle, then to paint the whole piece black. Once the paint is dry, duct tape a Fresnel lens to the piece. Cut out four more cardboard pieces. Two will be as wide as the television screen’s width, two will be as wide as the screen’s height and all four will be 45 cm long. Paint the four piece
