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Made "round", using the current 12-position 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 wire, basic insulation, conductor diameter 1.25mm, outer diameter 1.7mm, size source Multi-Contact FLEXI-E 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 20 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/atmel-8235-8-bit-avr-microcontroller-attiny20_datasheet.pdf#page=212), generated with kicad-footprint-generator Molex Micro-Fit 3.0 Connector System, 5267-04A, 4 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 502382-0470 (http://www.molex.com/pdm_docs/sd/5023820270_sd.pdf), generated with kicad-footprint-generator Tantalum Capacitor SMD AVX-U (7361-438 Metric), IPC_7351 nominal, (Body size from: http://datasheets.avx.com/AVX-HV_MLCC.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 68 Pin (JEDEC MS-013AB, https://www.analog.com/media/en/package-pcb-resources/package/33254132129439rw_18.pdf), generated with kicad-footprint-generator JST PH series connector, B22B-PHDSS (http://www.jst-mfg.com/product/pdf/eng/ePHD.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 4 times 0.75 mm² wires, basic insulation, conductor diameter 2.4mm, outer diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block WAGO 236-505, 45Degree (cable under 45degree), 9 pins, pitch 7.5mm, size 15x11mm^2, drill diamater 1.2mm, pad diameter 2.5mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_310551_RT015xxHDWU_OFF-022723S.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_TE-Connectivity THT Terminal Block WAGO 236-202 45Degree pitch 7.5mm size 81.5x15mm^2 drill 1.2mm pad 3mm Terminal Block 4Ucon ItemNo. 10702 vertical pitch 3.5mm size 18.5x8.3mm^2 drill 1.3mm pad 2.5mm terminal block RND 205-00080 vertical pitch 5mm size 40x12.6mm^2 drill 1.3mm pad 2.5mm terminal block Metz Connect Type171_RT13704HBWC, 4 pins, pitch 5mm, size 122x14mm^2, drill diamater 1.3mm, pad diameter 2.8mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_310111_RT055xxHBLC_OFF-022717S.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix PT-1,5-12-3.5-H pitch 3.5mm size 46.2x7mm^2 drill 1.2mm pad 3mm single screw terminal block Metz Connect Type073_RT02603HBLU, 3 pins, pitch 5mm, https://katalog.we-online.de/pbs/datasheet/820542711.pdf Varistor, diameter 15.5mm, width 7.5mm.

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