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BackHave. There aren't a lot of wiring and increases risk of noise on power rails. Things best left to external modules: CV-controlled CV offset module - add a switch to disable the clock, and a momentary-on button to advance the step manually. This requires hardware de-bouncing to avoid putting any UX connections on the rails v_wall(h=4, l=height-rail_clearance*2-thickness, th=thickness*1.25); v_wall(h=4, l=height-rail_clearance*2, th=right_rib_thickness); //outline of whole PCB? // cube([137.5, 97, 1], center=true); working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff working_increment = working_height / 6; // generally-useful spacing amount for vertical columns of stuff col_middle = col_left + (15.6 + 1.5 + 7 segment green One digit 7 segment green LED, http://www.kingbright.com/attachments/file/psearch/000/00/00/CA56-12SURKWA(Ver.8A).pdf 4 digit 7 segment green, https://docs.broadcom.com/docs/AV02-2553EN -1 overflow 7 segment green, https://docs.broadcom.com/docs/AV02-2553EN One digit 7 segment green LED, http://www.kingbrightusa.com/images/catalog/SPEC/CA56-11GWA.pdf 4 digit 7 segment red LED One digit 7 segment LED display Double digit seven segment green LED 4 digit 7 segment high efficiency red, https://docs.broadcom.com/docs/AV02-2553EN One digit 7 segment green LED with right hand decimal, https://docs.broadcom.com/docs/AV02-1589EN 2 Digit 7 segemnt red/green LED Single digit 7 segment yellow, https://docs.broadcom.com/docs/AV02-2553EN One digit 7 segment green LED with left dot Overflow +- 1 orange LED display Double digit seven segment hyper red 7 segment display 38.1mm 1.5inch single digit 7 segment red LED Single digit 7 segement super bright orange LED display Dubble digit super bright orange LED with dot One digit 7 segment orange, common anode, 7.62x7.62mm, BGRA pin order, https://cdn-shop.adafruit.com/datasheets/BL-FL7680RGB.pdf RGB LED NeoPixel, https://cdn-shop.adafruit.com/product-files/2686/SK6812MINI_REV.01-1-2.pdf LED RGB Wurth PLCC-4 3528 LED RGB APFA3010 KINGBRIGHT 3x1.5mm Dual LED SMD 0402 (1005 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: https://www.vishay.com/docs/20035/dcrcwe3.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-1310, with PCB locator, 12 Pins (https://www.molex.com/pdm_docs/sd/026605050_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py PQFP, 112 pins, 20mm sq body, 0.65mm pitch (http://cache.freescale.com/files/shared/doc/package_info/98ASS23330W.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP, 132 pins, 24mm sq body, 0.635mm pitch (https://www.intel.com/content/dam/www/public/us/en/documents/packaging-databooks/packaging-chapter-02-databook.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP 132 Intel 386EX (https://www.intel.com/content/dam/www/public/us/en/documents/packaging-databooks/packaging-chapter-02-databook.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP, 132 pins, 24mm sq body, 0.635mm pitch (https://www.intel.com/content/dam/www/public/us/en/documents/packaging-databooks/packaging-chapter-02-databook.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP 132 Intel 386EX (https://www.intel.com/content/dam/www/public/us/en/documents/packaging-databooks/packaging-chapter-02-databook.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP, 132 pins, 24mm sq body, 0.635mm pitch (https://www.intel.com/content/dam/www/public/us/en/documents/packaging-databooks/packaging-chapter-02-databook.pdf, http://www.nxp.com/docs/en/application-note/AN4388.pdf PQFP 132 Intel 386EX PQFP, 144 Pin (https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/packaging/04r00479-02.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py PowerPAK 1212-8 Dual (https://www.vishay.com/docs/71656/ppak12128.pdf, https://www.vishay.com/docs/72598/72598.pdf PowerPAK 1212-8 Single Zetex, SMD, 8 pin package (http://datasheet.octopart.com/ZDT6758TA-Zetex-datasheet-68057.pdf Diodes Incorporated PowerDI3333-8 UXC, 3.05x3.05x0.8mm Body, https://www.diodes.com/assets/Package-Files/PowerDI3333-8%20(Type%20UXC).pdf Infineon, PG-TDSON-8, 6.15x5.15x1mm, https://www.infineon.com/dgdl/Infineon-BSC520N15NS3_-DS-v02_02-en.pdf?fileId=db3a30432239cccd0122eee57d9b21a4 X1SON.