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Amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the top (mm) hole_dist_top = 2.5; // margins from edges h_margin = thickness*2; v_margin = hole_dist_top*2 + thickness; working_height = height - v_margin*2 - title_font_size; working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical.

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