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DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the left sub-panel top_row = height - v_margin*2 - title_font_size; working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff col_left = thickness + 6 + tolerance; rail_depth = 27.4 + tolerance; // rib + half a jack col_right = width_mm - hole_dist_side, height - 25; // build up to 1amp https://www.youtube.com/watch?v=pQKN30Mzi2g - maybe not as efficient.

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