3/13/2023: found a defect in this design, revising.
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An adapter board for Elecraft KX2/ KX3 to connect to microHAM micro KEYER III DB37 with standard 3.5mm TRS and TRRS cables.
See blog post for more detail.
KiCad 7.0 files in this repo are licensed under CC BY-SA 4.0. Use at your own risk.