I wanted to use a pluggable breakout-board to connect small probes to my PoScope, which has a 25-pin D plug. Others may find this useful so I’ve presented the Eagle files etc., below.
As can be seen from the photo above, my BOB has on-board 2mm sockets – 8 for each channel, together with switchable tie-down 10K resistors to GND.
The schematic is given below, together with the PCB foil pattern.
Note that there’s a single link to be made on the top of the board underneath the PORT B switches. I also connected the GND lead (to the equipment under test) from this point. Since there will always be a GND point, I didn’t see the point of making this pluggable.
The Eagle Schematic and Board are here: http://joebrown.org.uk/images/PoScope BOB/PoScope Add-on.zip
All parts are available from my handy local stockist ESR.