dual slide fader (2)

10-36 - elektor october 1980 The circuit for a dual slide fader published in the March 1980 issue of Elektor suffers from one main disadvantage, namely that it will not change slides auto- matically on projectors with this facility. In this article the dual fader is combined with a control circuit to provide slide changing on two projectors. The dual slide fader has proved to be a highly popular circuit both to construct and to use. This article sets out to add a little more sophistication to the original circuit. The purpose of the slide fader is to change the picture on the screen from one projector to the other by simply fading one projector lamp on and the other off. This is carried out by operating a potentiometer. It will be apparent that if a slide is to be changed, it will be on the projector that is not showing a slide, and at a time that the projector lamp is not lit. In other words, when the lamp is turned off - change the slide. The circuit diagram in figure 1 shows ...