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LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the shaft on the top knobs top_row = height - v_margin - title_font; saw_out = [h_margin + working_width/4, row_1, 0]; f_tune = [h_margin+working_width/8, row_4, 0]; pwm_cv_lvl = [width_mm - h_margin - working_width/8, row_4, 0]; left_rib_x = thickness * 1; //right_rib_x = width_mm - 9.5/2 - right_rib_thickness - tolerance; // rib + half a jack col_right = width_mm - thickness*2.5 - tolerance*6; out_row_1 = v_margin+12; out_row_2 = out_working_increment*1 + out_row_1; out_row_5 = out_working_increment*4 + out_row_1; out_row_7 = working_increment*6 + out_row_1; out_row_4 = working_increment*3 + row_1; row_3 = working_increment*2 + row_1; working_increment = working_height / 5; row_1 = bottom_row .

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