So, latest addition to the family of BKM-129X compatibles, is a full size BNC version.
This is functionally quite close to the original, as it now has BNC outputs also. Since I couldn’t find BNC plugs featuring auto-termination (at a reasonable cost at least), I decided to add a switch to each signal which will either terminate to 75 Ohm, or enable passthrough of the signal to the OUT port.
It is then possible to set the switches to OFF (down) and use external terminators, or simply skip mounting the switches altogether, and add a jumper/0 Ohm resistor to the lower left two pins of each switch footprint, and then use external terminators.
The board requires the same Arduino with the BKM-129X-MCU code, directly programmed to the Arduino with a programmer (read some of my previous posts regarding this).
The MCU code is here: https://github.com/skumlos/bkm-129x-mcu
The Kicad project for the board here: https://github.com/skumlos/bkm-129x-simple-full
The 3D printable bracket here: https://www.thingiverse.com/thing:4462796
Please copy, share, produce and become rich, of this 🙂