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.
The Completed PoScope Logic Analyzer BOB
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.
PoScope Logic Analyzer BOB Schematic
PoScope Logic Analyzer BOB 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.
Pluggable Flylead connectors
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.
Link to this page
