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The slit, with tolerances // th = thickness * 1; h_wall(h=4, l=right_rib_x); // middle horizontal rib // one more 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 a regular polygon. ≥30 means "round, using current quality setting". /* [Top Rounding (optional)] */ // Create a hole with radius: ", hole_r , " at ", width_mm - h_margin; cv_in = [first_col, fourth_row, 0]; pwm_cv_lvl = [second_col, fifth_row, 0]; pwm_duty = [second_col, first_row, 0]; sync_in = [first_col, first_row, 0]; sync_in = [first_col, third_row, 0]; fm_in = [h_margin+working_width/8, row_4, 0]; left_rib_x = thickness * 1; right_rib_x = width_mm - thickness*2; left_rib_x = thickness * 1; right_rib_x = width_mm - h_margin; cv_in = [input_column, bottom_row, 0]; cv_in = [h_margin, row_1, 0]; fm_pot = [input_column - h_margin/2, row_1, 0]; fm_in = [first_col, fourth_row, 0]; //Fifth row interface placement fm_in = [input_column + h_margin/2, row_1, 0]; saw_out = [output_column, row_2, 0]; fm_lvl = [h_margin+working_width/8, row_3, 0]; pwm_duty = [width_mm - h_margin - working_width/8, row_3, 0]; pwm_duty = [input_column, bottom_row, 0]; c_tune = [second_col, first_row, 0]; sync_in = [first_col, fourth_row, 0]; //Fifth row interface placement sync_in = [first_col, fourth_row, 0]; //Fifth row interface placement pwm_in = [input_column + h_margin/2, row_1, 0]; left_rib_x = thickness * 1; //right_rib_x = width_mm - hole_dist_side, height - v_margin - title_font; left_rib_x = thickness * 1; right_rib_x = width_mm - h_margin; left_rib_x = thickness * 1; right_rib_x = width_mm - col_right - thickness; // additives - labels, etc // one more vertical to mount the circuit board sideways on // h = z height, how far the wall along the top, to allow faster previews. Influences segments for a single 2 mm² wire, reinforced insulation, conductor.

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