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My Oklahoma State University History: While studying Electrical Engineering at OSU, I was asked to design and build an electronic dimming system for the University Auditorium. The Silicon Controlled Rectifier (SCR), a solid state device CIRCA 1964 was the basis of the design. Shown in the photo is the system being tested in a workspace at the power generation lab at the University. My faculty sponsors were Dr. Bristow and Dr. Davis. The unit was installed and operational until the University Auditorium was replaced by a new audortium. The system provided 30 circuits 1200 watts each. The console shown in the photo provided three banks of control. I think this was the first system like this paving the way for curremt technology dimmers.
Control console, shown on the left, was fabricated in Tulsa, Oklahoma. Once assembeled, its contents included 90 faders and three master faders. The console was installed in a control booth at the back of the auditorium. The large cabinet (center) contained 30 dimmer circuits, each in 30 amp quick disconnect modules and a breaker panel. The cabinet was installed in a room under the stage. A circuit trunk was installed from the cabinet to a panel next to the existing old dimmer system.
Control printed circuit boards were etched in Dr. Bristow's lab in the Engineering building; components for the circuit boards were assembeled and tested in the basement of the Sigma Chi house, 1101 University during the summer of 1965.
Looking back from 2018, I appreciate the confidence that the University had in me to take on this project.