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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 the classic "Maths" module exist for a single 0.25 mm² wire, basic insulation, conductor diameter 0.9mm, outer diameter 1.7mm, outer diameter 1mm, size source Multi-Contact FLEXI-xV 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 28 Pin (http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/05081926_0_UDE28.pdf), generated with kicad-footprint-generator Soldered wire connection, for 2 times 0.5 mm² wires, reinforced insulation, conductor diameter 0.9mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-E 2.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with StandardBox.py) (http://www.altechcorp.com/PDFS/PCBMETRC.PDF Altech AK300 terminal block, pitch 5.08mm, size 20.3x11.2mm^2, drill diamater 1.2mm, pad diameter 2.6mm, see http://www.4uconnector.com/online/object/4udrawing/10702.pdf, script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00087, vertical (cable from top), 4 pins, pitch 5.08mm, size 25.4x11.2mm^2, drill diamater 1.3mm, pad diameter 2.1mm, see http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F282834%7FC1%7Fpdf%7FEnglish%7FENG_CD_282834_C1.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block WAGO 804-115, 45Degree (cable under 45degree), 2 pins, pitch 5.08mm, size 10.2x8mm^2, drill diamater 1.15mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block Metz Connect Type086_RT03404HBLC, 4 pins, WP154A4, https://www.kingbright.com/attachments/file/psearch/000/00/00/L-154A4SUREQBFZGEW(Ver.11A).pdf LED diameter 5.0mm z-position of LED center 3.0mm, 2 pins diameter 1.8mm size 1.8x2.4mm^2 z-position of LED center 2.0mm 2 pins Rectangular size 4.0x2.8mm^2 diameter 2.0mm THT pad THT pad as test Point, diameter 1.5mm, size source Multi-Contact FLEXI-xV 2.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator LED.

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