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The author “Then” (left) and “Now” (right)ĭot and Tape refers to the product used to lay the patterns of tracks and IC/transistor pads on to mylar sheets. The finished piece of Rubylith was the negative of the layout (and in 1:1 scale) and was placed over the photo resist and then exposed to light. I can only assume that they used some template placed on the Rubylith and exposed the area where the metal would be.
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I don't really recall how one created IC and transistor pads. I was only introduced to this at the start of my career in 1976 and never actually worked with it. It was really good for earth planes, but I am not sure if double sided layout was possible and certainly a track between IC pins was impossible. The technique required a completely different mindset to today’s “positive” approach. Generating a PCB layout was done in the negative, removing the red film where there was to be track. This consisted of a thin red film stuck to a mylar film. In addition to writing several articles for Circuit Cellar and having ideas published in EDN and Electronic Design, Aubrey wrote Excel by Example: A Microsoft Excel Cookbook for Electronics Engineers (Newnes, 2004).īefore Dot and Tape (see below) there was Rubylith. Aubrey is engineering manager at Emphatec, a Toronto-based design house of industrial control interfaces and switch-mode power supplies.
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Editor’s Note: This “How it Was” story is told by Aubrey Kagan, who is a professional engineer with a BSEE from the Technion-Israel Institute of Technology and an MBA from the University of the Witwatersrand.