computer-controlled slide fader - can also be used for phase gating other devices

computer-controlled els (ader elektor december 1984 The use of two slide projectors and this computer-controlled slide fader enables the pictures to fade into each other on the screen at a variety of speeds. The fader is a versatile circuit that can be used for a number of applications other than the control of slide projectors. It allows the gating angle of two devices, such as lamps or motors, to be arranged by computer: the angle may be increased or reduced automatically at up to sixty-three different speeds. Within a given program, the circuit also provides for the independent actuating of up to four relays. Moreover, it provides an eight-bit input for data from equipment connected to it. comn uter-controlled slide fader... ...can also be used for phase gating other devices Figure 1. This block diagram gives a clear view of the function of the complete circuit. The circuit came into being from a desire to design an easy-to-use slide fader that could be controlled by a computer...