What postprocessing do I have to do before making the modEEG pcbs?
The modEEG pcbs are double sided with (plated through) vias and make heavy use of “copper pouring”. Therefore the EAGLE *.brd files have to be postprocessed before printing in the EAGLE CAD software with the “ratsnest” command. Make sure Menu->options->set->misc->”Ratsnest processes polygones” is checked. If the option is unchecked or no ratsnest is done, you do not get all the important electrical connections that are implicitly done by the large so called “copper pouring” polygons and the plated through vias – that are electrical vertical connections from top to bottom layer. Instead with “ratsnest” you get many thin yellow air-wires that indicate missing connections between nodes (pins, pads) and would have to be soldered manually if you should decide to use no copper pouring (what would be absolutely no good idea!). The openEEG developer teams decision to use double layer and copper pouring is well founded, because it is essential for reduction of RF interference and mains hum capa
