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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.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot369-1_po.pdf SSOP, 16 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ri_soic_ic/ri_16_1.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py PQFP, 240 Pin (http://www.microsemi.com/index.php?option=com_docman&task=doc_download&gid=131095), generated with kicad-footprint-generator JST XA series connector, 501331-1107 (http://www.molex.com/pdm_docs/sd/5013310207_sd.pdf), generated with kicad-footprint-generator Molex 734 Male header (for PCBs); Angled solder pin 1 x 1 mm, 734-144 , 14 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSSOP, 20 Pin (JEDEC MO-153 Var GD https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 14, Wuerth electronics 9775086960 (https://katalog.we-online.com/em/datasheet/9775086960.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series.

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