[TriEmbed] DIY a Time-Domain Reflectometer for your Oscilloscope!

[Scott Hall]

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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