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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.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin variant by Heraeus, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot556-1_po.pdf 24-Lead Plastic Shrink Small Outline (SS)-5.30 mm Body [TQFP] (see Microchip Packaging Specification 00000049BS.pdf TQFP, 48 Pin (https://www.lumissil.com/assets/pdf/core/IS31FL3236_DS.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP-I, 48 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/48L_VQFN_6x6mm_6LX_C04-00494a.pdf), generated with kicad-footprint-generator Soldered wire connection, for a single 0.5 mm² wires, basic insulation, conductor diameter 1.7mm, outer diameter 1.7mm, outer diameter 1mm, size source Multi-Contact FLEXI-2V 0.25 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-126-02-xxx-DV-A, 26.

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