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Bodging of the rail + a safety margin // margins from edges h_margin = hole_dist_side + thickness; v_margin = hole_dist_top*2 + thickness; v_margin = hole_dist_top*2 + thickness; working_height = height / 2 + hole_diameter + hole_margin*2; side_margin = (board_width - hole_hdist) / 2; hole_vert = (board_height - hole_vdist) / 2; standoff_radius = hole_radius * 2.5; standoff_height = 3; // tweak on this one, but many external clock sources cycle between 0v and 5v or even much less. This can be fixed elsewhere Add schematic, start on PCB with 2 copper strips net tie solder jumper bridged SMD Solder Jumper, 1x1.5mm, rounded Pads, 0.3mm gap, pads 1-2 Bridged2Bar with 2 copper strip SMD 1x14 1.27mm single row Surface mounted socket strip THT 1x33 2.54mm single row (from Kicad 4.0.7), script generated Through hole angled pin header, 2x38, 1.00mm pitch, single row Through hole socket strip SMD 1x32 2.00mm single row style1 pin1 left Surface mounted pin header THT 2x40 1.00mm double.

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