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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 EPCOS app note 93 (https://www.catagle.com/45-2/PDF_AN93.htm Bourns TBU-CA Fuse, 2 Pin (https://www.bourns.com/data/global/pdfs/TBU-CA.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 202396-1007 (http://www.molex.com/pdm_docs/sd/2023960207_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 48 Pin (http://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.3.pdf#page=67), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: A-41791-0017 example for new mpn: 39-30-0140, 7 Pins per row (https://cdn.harwin.com/pdfs/M20-781.pdf), generated with kicad-footprint-generator XP_POWER IA48xxD DIP DCDC-Converter XP_POWER IHxxxxS, SIP, (https://www.xppower.com/pdfs/SF_IH.pdf), generated with kicad-footprint-generator Molex Pico-Lock series connector, 64800911622 (https://katalog.we-online.com/em/datasheet/6480xx11622.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 1.5/2-H-3.5 1990737 Connector Phoenix Contact connector footprint for: MSTB_2,5/3-GF-5,08; number of pins: 10; pin.

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