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36; // [1:1:84] //Second row interface placement sync_in = [first_col, third_row, 0]; //Fourth row interface placement triangle_out = [width_mm-h_margin-working_width/4, row_1, 0]; fm_pot = [input_column + h_margin/2, bottom_row, 0]; c_tune = [width_mm/2 + h_margin, top_row, 0]; f_tune = [second_col, first_row, 0]; c_tune = [width_mm/2 + h_margin, top_row, 0]; left_rib_x = thickness * 1; h_wall(h=4, l=right_rib_x); // middle horizontal rib // one more vertical 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 the top if you want to socket the timing capacitors. ** Use only four (4) potentiometers, either 9 mm or 16 mm vertical board mount OR: | | .

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