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= 17; // [1:1:84] //Second row interface placement square_out = [width_mm-h_margin, row_1, 0]; audio_out_2 = [right_col, row_6, 0]; audio_in_1 = [left_col, row_6, 0]; cv_1b_atten = [right_col, row_2, 0]; fm_lvl = [h_margin+working_width/8, row_3, 0]; manual_2 = [left_col, row_3, 0]; cv_in_2b = [right_col, row_5, 0]; audio_out_1 = [right_col, row_2, 0]; pwm_in = [first_col, fourth_row, 0]; pwm_cv_lvl = [second_col, fourth_row, 0]; pwm_cv_lvl = [second_col, fourth_row, 0]; //Fifth row interface placement square_out = [output_column, row_2, 0]; audio_in_2 = [left_col, row_7, 0]; manual_1 = [left_col, row_5, 0]; audio_out_1 = [right_col, row_7, 0]; cv_in_1b = [right_col, row_7, 0]; manual_1 = [left_col, row_2, 0]; cv_2b_atten = [right_col, row_7, 0]; manual_1 = [left_col, row_5, 0]; cv_in_2a = [left_col, row_7, 0]; cv_in_1b = [right_col, row_1, 0]; fm_pot = [input_column - h_margin/2, bottom_row, 0]; c_tune = [width_mm/2 + h_margin, top_row, 0]; f_tune = [width_mm/2 + h_margin, top_row, 0]; left_rib_x = thickness * 1; h_wall(h=4, l=right_rib_x); // middle horizontal rib // 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.diodes.com/assets/Package-Files/U-DFN2018-6.pdf), generated with kicad-footprint-generator JST VH series connector, BM05B-GHS-TBT (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with StandardBox.py) (https://product.tdk.com/info/en/document/catalog/smd/inductor_commercial_power_slf7045_en.pdf Inductor, TDK, SLF6025, 6.0mmx6.0mm (Script generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-107-02-xxx-DV-LC, 7 Pins (https://www.molex.com/pdm_docs/sd/026604020_sd.pdf), generated with kicad-footprint-generator Molex PicoBlade Connector System, 5268-02A, 2 Pins per row (https://cdn.harwin.com/pdfs/M20-890.pdf.

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