I recently had to revamp one of my company's more-than-30-year-old designs. Like any project these days, the new design needed to be smaller, cheaper, include many more functions, and see completion in a relatively short time. To decrease risk, I chose to reuse much of the physical interface from the previous design, including a transformer-isolated interface to the outside world. However, the constraints of a smaller design, coupled with the new functions I was adding, did not allow for 100% reuse of the existing components for this interface.
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