synth_tools

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(HP // margins from edges v_margin = hole_dist_top*2 + thickness; right_rib_x = width_mm - h_margin; cv_in = [first_col, fifth_row, 0]; pwm_duty = [width_mm - h_margin - working_width/8, row_2, 0]; audio_in_2 = [left_col, row_3, 0]; c_tune = [width_mm/2, top_row, 0]; f_tune = [h_margin+working_width/8, row_4, 0]; pwm_cv_lvl = [width_mm - h_margin - working_width/8, row_3, 0]; manual_2 = [left_col, row_6, 0]; cv_1b_atten = [right_col, row_5, 0]; cv_in_2a = [left_col, row_7, 0]; cv_in_1b = [right_col, row_1, 0]; fm_in = [input_column + h_margin/2, bottom_row, 0]; c_tune = [width_mm/2 + h_margin, top_row, 0]; f_tune = [second_col, third_row, 0]; fm_lvl = [second_col, fifth_row, 0]; pwm_duty = [input_column, row_2, 0]; square_out = [third_col, fifth_row, 0]; square_out = [output_column, row_2, 0]; fm_lvl = [second_col, first_row, 0]; c_tune = [width_mm/2 - h_margin, top_row, 0]; left_rib_x = hole_dist_side + thickness; working_height = height - v_margin*2 - title_font_size; working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff col_left = h_margin; bottom_row = v_margin + 12; row_1 = v_margin+12; out_row_2 = working_increment*1 + row_1; //special-case the knob is stopped by something mounted to the lack of a pot rotary_knob_row = top_row - 30; left_rib_x = thickness * 2; right_rib_x = width_mm - thickness*2; // draw a "vertical" wall 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.

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