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Knobs plus space between them right_panel_width = 12; // The OpenSCAD default. // Minimum size of circle fragments in mm. // ====================================================================== // Prevent anything following from showing up as Customizer parameters. /* [Hidden] */ // Line segments for a clock on the circuit board to, dead center // pcb_holder(h=10, l=top_row-rail_clearance*2-15-thickness, th=1.15, wall_thickness=1); // Create a hole with radius: ", hole_r , " at ", hole_dist_side, height - v_margin; working_increment = working_height / 6; // generally-useful spacing amount for vertical columns of stuff col_left = h_margin; col_right = width_mm - thickness*2; // draw panel, subtract holes panel(width); // waves out wall(h=4, w=width_mm-hole_dist_top-4); // one more vertical 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 (https://www.jedec.org/sites/default/files/docs/MO-193D.pdf variant AB), generated with kicad-footprint-generator connector Harting har-flexicon series connector, 502382-1570 (http://www.molex.com/pdm_docs/sd/5023820270_sd.pdf), generated with kicad-footprint-generator Molex JAE 0.2mm pitch, 1mm overall height FFC/FPC connector, FH12-40S-0.5SH, 40 Pins (http://www.molex.com/pdm_docs/sd/5024301410_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 48 Pin (http://www.analog.com/media/en/technical-documentation/data-sheets/LTC7810.pdf), generated with kicad-footprint-generator Resistor SMD 2010 (5025 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: http://www.vishay.com/docs/20056/crcw01005e3.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 48 Pin (https://www.nxp.com/docs/en/package-information/98ASA00694D.pdf DFN8 2x2, 0.5P (https://www.onsemi.com/pub/Collateral/511AT.PDF On Semiconductor, SIP-38, 9x7mm, (https://www.onsemi.com/pub/Collateral/AX-SIP-SFEU-D.PDF#page=19 8-Lead Plastic Dual Flat, No Lead Package, 1.2x1.8x1.55 mm Body [DFN] (http://www.onsemi.com/pub/Collateral/NCP4308-D.PDF DD Package; 8-Lead Plastic Dual Flat, No Lead Package, 1.2x1.8x1.55 mm Body [DFN] (http://www.onsemi.com/pub/Collateral/NCP4308-D.PDF DD Package; 12-Lead Plastic Micro Small Outline Package (MS) [MSOP], variant of 10-lead though-hole mounted DIP package, row spacing 16.51 mm (650 mils), SMDSocket, LongPads 6-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils 4-lead surface-mounted (SMD) DIP package, row spacing 7.62 mm (300 mils), body size 9.78x4.72mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/209-210.pdf), LowProfile 12x-dip-switch SPST , Slide, row spacing 7.62 mm.

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