dual slide fader (1) - for smooth, continuous projection

3-24 — elektor march 1980 for smooth, continuous projection Enthusiastic amateur photographers and professionals are not only interested in making good pictures: they also want to present them properly. For a slide show, the professional "trick" of using two projectors alternately is becoming increasingly popular - the "black" gap between successive slides can be eliminated in this way. For the finishing touch, each following slide should be gradually blended into the existing picture. This is where the dual slide fader comes in: as the brightness of one projector is smoothly increased, the other is gradually faded out. A complete dual projection installation consists of two slide projectors and a control unit. Complete, integrated units also exist — everything built into one case — but it is more common to use a separate control unit with two standard projectors. Most commercially available units have one disadvantage in common: they are expensive. The reason for this is th...