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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 circumference of the hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1924004 16A (HC Generic Phoenix Contact SPT 2.5/12-H-5.0 Terminal Block, 1719231 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719231), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-0730, 7 Pins (http://www.molex.com/pdm_docs/sd/559350530_sd.pdf), generated with kicad-footprint-generator Molex Panelmate series connector, SM07B-SHLS-TF (http://www.jst-mfg.com/product/pdf/eng/eSHL.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-127-02-xxx-DV, 27 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: A-41791-0003 example for new part number: 22-27-2091, 9 Pins (https://www.molex.com/pdm_docs/sd/009652028_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 6 times 1.5 mm² wires, reinforced insulation, conductor diameter 0.48mm, outer.

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