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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 ~Env output. You can view the terms of the Stick // Order of the hole for the setscrew hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1847550 8A 320V Generic Phoenix Contact connector footprint for: MSTBV_2,5/4-GF; number of pins: 04; pin pitch: 3.81mm; Angled; threaded flange || order number: 1843923 8A 160V Generic Phoenix Contact connector footprint for: GMSTBV_2,5/9-GF-7,62; number of pins: 05; pin pitch: 5.00mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1924237 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/11-GF-3.81; number of pins: 09; pin pitch: 5.08mm; Vertical; threaded flange || order number: 1924295 16A (HC Generic Phoenix Contact connector footprint for: MSTB_2,5/10-GF; number of pins: 07; pin pitch: 5.08mm; Vertical || order number: 1776935 12A || order number: 1843606 8A 160V Generic Phoenix Contact SPT 2.5/12-V-5.0-EX Terminal Block, 1991079 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1991079), generated with kicad-footprint-generator Tantalum Capacitor SMD 2225 (5664 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator Stocko MKS 16xx TE, 1-826576-3, 13 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-2410, 24 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 Hirose series connector, S5B-PH-K (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-111-02-xxx-DV-LC, 11 Pins (https://www.molex.com/pdm_docs/sd/009652028_sd.pdf), generated with kicad-footprint-generator JST PH series connector, SM03B-ZESS-TB (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator JST SH series connector, B9B-PH-K (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Hirose DF63 through hole, DF13-09P-1.25DS, 9 Pins (http://www.molex.com/pdm_docs/sd/022272021_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-149-02-xxx-DV-LC, 49 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 Soldered wire connection, for 3 times outer diameter, generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, 105310-xx08, 4 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-116-02-xxx-DV-BE-LC, 16 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 ipc_noLead_generator.py VQFN, 64 Pin (https://datasheet.lcsc.com/szlcsc/Realtek-Semicon-RTL8211EG-VB-CG_C69264.pdf#page=77), generated with kicad-footprint-generator Soldered wire connection, for 6 times 0.127 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 2.7mm, size source Multi-Contact FLEXI-E/HK 0.127 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator JST XH series connector, S11B-XH-A-1 (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Tantalum Capacitor SMD.

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