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At work I still use an old 'company' DOS program to design Pi or T attenuators. It dates back to the 1980s but it works really well.
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Do you know what version of DOS that runs on ? I really like vintage DOS programs.
It is a bit time consuming using the equations. I left the equations I worked out myself in the unsimplified form with the 4 inside the square root sign to remind me that the solution was a quadratic ! I guess I could write an assembly language program to run in DOS on my vintage computer would be a bit of fun.