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** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the dial. Set to zero if you download the image via fetch_file_contents and mirror it. // Order of the rail + a safety margin // margins from edges h_margin = hole_dist_side + thickness; right_rib_x = width_mm - thickness*2.5 - tolerance*6; out_row_8 = working_increment*7 .

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