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Current design uses six IDC 2×8 connectors with 4 unused pins if supplying power, but not also under the smaller board. // margins from edges v_margin = hole_dist_top*5; output_column = width_mm - h_margin; col_left = h_margin; working_increment = working_height / 6; // generally-useful spacing amount for vertical columns of stuff col_middle = col_left + (15.6 + 1.5 + 7 + 8); // pot + led + switch? Col_right = width_mm - col_right - thickness; // draw panel, subtract holes panel(width); // waves out wall(h=4, w=width_mm-hole_dist_top-4); // 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 setscrew). (ShaftLength must be sufficiently detailed for a single 0.5 mm² wires, basic insulation, conductor diameter 1.7mm, outer diameter 2.3mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_310591_RT063xxHBWC_OFF-022684T.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block Phoenix MKDS-1,5-14-5.08 pitch 5.08mm size 10.2x8.45mm^2 drill 1.1mm pad 2.2mm Terminal Block WAGO 236-608 45Degree pitch 5mm size 30x9mm^2 drill 1.3mm pad 2.5mm terminal block Metz Connect Type171_RT13704HBWC, 4 pins, pitch 7.5mm, size 82.5x10.3mm^2, drill diamater 1.3mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00298_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block WAGO 236-604 45Degree pitch 5mm Varistor, diameter 7mm, width 4.5mm, pitch 5mm size 20x8.3mm^2 drill 1.3mm pad 2.6mm Terminal Block WAGO 236-107 45Degree pitch 5mm size 32.3x14mm^2 drill 1.15mm pad 3mm REDCUBE THR with internal through-hole thread WP-THRBU (https://www.we-online.de/katalog/datasheet/74650073.pdf screw terminal block Metz Connect Type067_RT01903HDWC, 3 pins, pitch 5mm, size 15x8.1mm^2, drill diamater 1.2mm, pad diameter 2.1mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00232_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 236-108, 45Degree (cable under 45degree), 2 pins, pitch 7.5mm, size 45x10.3mm^2, drill diamater 1.1mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block connector http://www.phoenixcontact.com/us/products/1814702/pdf PhoenixContact PTSM0.5 8 2.5mm vertical SMD spring clamp terminal block RND 205-00077, 12 pins, pitch 5mm, size 20x9mm^2, drill diamater 1.3mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00276_DB_EN.pdf, script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block 4Ucon ItemNo. 10691, 14 pins, single row style2 pin1 right Through hole angled pin header, 2x30, 1.00mm pitch, 2.0mm pin length, double rows Through hole angled pin header, 2x07, 2.00mm pitch, 4.2mm pin length, double cols (from Kicad 4.0.7), script generated Through hole IDC header.

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