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= 75 + tolerance; // left_rib_x = thickness * 2; right_rib_x = width_mm - h_margin; left_rib_x = thickness + 9.5/2 + tolerance*2; // rib + half a jack col_right = width_mm - 9.5/2 - right_rib_thickness - tolerance; // rib + half a jack col_right = width_mm - h_margin; left_rib_x = thickness * 2; right_rib_x = width_mm - h_margin; input_column = h_margin; col_right = width_mm - 9.5/2 - right_rib_thickness - tolerance; // left_rib_x = thickness * 1.2; right_rib_x = width_mm - thickness*2.5 - tolerance*6; out_row_1 = v_margin+12; // 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 (or derived from) the Work (including but not to front panel .

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