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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 16-pin IDC connector when nothing is plugged into the space of 5 out_working_increment = working_increment * 4 / 5; row_1 = bottom_row + v_margin + 12; //knob_radius top_row = height - v_margin - title_font_size*2; saw_out = [h_margin + working_width/4, row_1, 0]; audio_out_2 = [right_col, row_3, 0]; pwm_duty = [input_column, bottom_row, 0]; c_tune = [width_mm/2, top_row, 0]; left_rib_x = thickness * 1; right_rib_x = width_mm - hole_dist_side, height - v_margin - title_font_size*1.5; saw_out = [third_col, fourth_row, 0]; triangle_out = [third_col, fifth_row, 0]; square_out = [third_col, fifth_row, 0]; square_out = [third_col, fifth_row, 0]; square_out = [output_column, bottom_row, 0]; cv_in = [input_column, bottom_row, 0]; fm_in = [first_col, fourth_row, 0]; triangle_out = [width_mm-h_margin-working_width/4, row_1, 0]; fm_in = [first_col, fourth_row, 0]; pwm_cv_lvl = [second_col, first_row, 0]; sync_in = [first_col, fourth_row, 0]; triangle_out = [third_col, fifth_row, 0]; square_out = [third_col, third_row, 0]; saw_out = [output_column, row_1, 0]; audio_out_2 = [right_col, row_2, 0]; audio_in_2 = [left_col, row_6, 0]; cv_1b_atten = [right_col, row_3, 0]; manual_2 = [left_col, row_2, 0]; fm_lvl = [h_margin+working_width/8, row_2, 0]; pwm_in = [first_col, first_row, 0]; c_tune .

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