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(HP row_2 = row_1 + v_margin + 12; top_row = height - v_margin*2 - title_font_size; working_increment = working_height / 6; // generally-useful spacing amount for vertical columns of stuff col_left = h_margin; bottom_row = v_margin + 12; //knob_radius top_row = height - v_margin - title_font; left_rib_x = thickness * 1; right_rib_x = width_mm - hole_dist_side - thickness; // 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 a decade counter with.

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