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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 (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S package, 2-pin, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot505-1_po.pdf TSSOP, 8 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/8L_TDFN_2x3_MNY_C04-0129E-MNY.pdf), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, FH12-28S-0.5SH, 28 Pins per row (https://cdn.harwin.com/pdfs/M20-890.pdf), generated with kicad-footprint-generator Molex Molex 1.00mm Pitch Easy-On BackFlip, Right-Angle, Bottom Contact FFC/FPC, 200528-0090, 9 Circuits (https://www.molex.com/pdm_docs/sd/2005280090_sd.pdf), generated with kicad-footprint-generator Samtec HLE top entry Molex MicroClasp Wire-to-Board System, 55932-0610, with PCB locator, 3 Pins per row (http://www.molex.com/pdm_docs/sd/460071105_sd.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 46007-1103, With thermal vias in pads, 3 Pins per row (http://www.molex.com/pdm_docs/sd/431605304_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SOP, 8 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/8L_TDFN_2x3_MNY_C04-0129E-MNY.pdf), generated with kicad-footprint-generator JST PHD series connector, LY20-14P-DLT1, 7 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator Molex MicroClasp side entry Molex Pico-Clasp series.

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