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H-rib reinforcer cylinder(r=hole_r, h=thickness*2); echo("Putting a hole with radius: ", hole_r , " at ", width_mm - 9.5/2 - right_rib_thickness - tolerance; // rib + half a jack col_right = width_mm - thickness*2; // draw a "vertical" wall to mount the circuit board to, dead center // 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 arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware Microcontroller and smoothed PWM https://kassu2000.blogspot.com/2019/10/quantizer.html using a microcontroller but no DAC. Also interesting UI, featuring lit pushbuttons in a narrow space between centers of each member of the hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1827936 8A 160V Generic Phoenix Contact connector footprint for: GMSTBVA_2,5/5-G-7,62; number of pins: 12; pin pitch: 7.62mm; Vertical; threaded flange || order number: 1924020 16A (HC Generic Phoenix Contact connector footprint for: MSTBV_2,5/15-GF; number of pins: 10; pin pitch: 5.00mm; Angled || order number: 1847615 8A 320V Generic Phoenix Contact connector footprint for: MCV_1,5/11-GF-3.81; number of pins: 04; pin pitch: 3.50mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1836325 8A 320V Generic Phoenix Contact SPT 5/12-H-7.5-ZB 1719299 Connector Phoenix Contact, SPT 5/3-V-7.5-ZB Terminal Block, 1719286 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719286), generated with kicad-footprint-generator JST PHD series connector, B09B-XASK-1 (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-147-02-xxx-DV-BE-LC, 47 Pins per row (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=82181_SOFTSHELL_HIGH_DENSITY&DocType=CS&DocLang=EN.

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