A TDR is an intriguing measurement add-on -- it's used used to test the signal path on PCBs, to detect faults or breaks in cables, and some other neat tricks.
Ted Yapo built this one from an old design, but updated it with modern versions of 7400 logic. Hackaday.io Newletter "Tiny TDR": https://hackaday.io/project/164165-tiny-tdr
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