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+ thickness; right_rib_x = width_mm - col_right - thickness; // draw panel, subtract holes union() { z_position = height - v_margin - title_font; left_rib_x = 0; right_rib_x = width_mm - thickness; // How much horizontal space needed for left-hand and right-hand sub-panels left_panel_width = 40; // [1:1:84] //Second row interface placement f_tune = [width_mm/2 + h_margin, top_row, 0]; f_tune = [width_mm/2 + h_margin, top_row, 0]; f_tune = [second_col, first_row, 0]; c_tune = [width_mm/2, top_row, 0]; left_rib_x = thickness of the rail + a safety margin // margins from edges h_margin = thickness*2; v_margin = hole_dist_top*5; output_column = width_mm - h_margin; cv_in = [first_col, first_row, 0]; sync_in = [first_col, fifth_row, 0]; //right_rib_x = width_mm - thickness*2; // draw a "vertical" wall 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 the bottom of the glide capacitor.

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