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Back0]; audio_in_2 = [left_col, row_5, 0]; cv_in_2a = [left_col, row_3, 0]; manual_2 = [left_col, row_1, 0]; pwm_in = [input_column + h_margin/2, row_1, 0]; triangle_out = [output_column, row_2, 0]; audio_in_2 = [left_col, row_3, 0]; cv_in_2b = [right_col, row_1, 0]; f_tune = [second_col, third_row, 0]; saw_out = [h_margin + working_width/4, row_1, 0]; right_rib_x = width_mm - h_margin; input_column = h_margin; col_right = 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, 80¢ based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another version Alternative: CV from something else VCF MK's Diode Ladder VCF ~$8 in parts, mostly down to PCB edge 15.979999999999999mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 15-pin D-Sub connector horizontal angled 90deg THT female pitch 2.77x2.84mm pin-PCB-offset 9.4mm 25-pin D-Sub connector, horizontal/angled (90 deg.
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