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= out_working_increment*5 + out_row_1; rotary_knob_row = top_row - 30; working_width = width_mm - h_margin; input_column = h_margin; col_right = width_mm - col_right - thickness; // column from edge plus hole radius h_wall(h=4, l=slider_spacing * 10 + center_adjust; right_col = width_mm - h_margin; left_rib_x = thickness * 1; //right_rib_x = width_mm - thickness; // additives - labels, etc // 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.

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