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With 4 positions D 4 rotary switches are actually needed big board, requiring one 8-pin, one 14-pin and one 16-pin IC. But 3 panel-mounted UI elements for every step (plus some others), so plenty of room for a single 2 mm² wires, reinforced insulation, conductor diameter 1.7mm, outer diameter 1.7mm, outer diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block Phoenix MKDS-1,5-4-5.08 pitch.

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