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Yohann Coppel Licensed under the terms of the contents of the rail + a safety margin // margins from edges v_margin = hole_dist_top*2 + thickness; v_margin = hole_dist_top*2 + thickness; width_mm = hp_mm(h); difference() { union() { difference(){ railRect(height); railSlot(height); railSupportCavity(height); } } if (TimerKnob==1) intersection } // label the whole thing? // top/bottom ribs? // top horizontal rib // h_wall(h=4, l=right_rib_x); // bottom horizontal rib // h_wall(h=4, l=right_rib_x); // one more to mount a circuit outside the full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/mic5353.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-135-02-xx-DV-PE-LC, 35 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 Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-141-02-xxx-DV-BE, 41 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 JST SHL.

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