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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 SIP7, http://power.murata.com/data/power/ncl/kdc_nma.pdf Isolated 1W single output POE DCDC-Converter TRACO THN 10 to 30W, Single or dual Output, (https://www.tracopower.com/sites/default/files/products/datasheets/thn30_datasheet.pdf DCDC-Converter TRACO THN 10 to 30W, Single or dual Output, (https://www.tracopower.com/sites/default/files/products/datasheets/thn30_datasheet.pdf DCDC-Converter TRACO TEN20 Generic Traco THD 15WIN, 15W, THT (https://www.tracopower.com/products/thd15win.pdf#page=3 traco dcdc tht 12w DCDC-Converter, TRACO, TMR 1-xxxx, Dual output, http://www.cincon.com/upload/media/data%20sheets/Data%20Sheet%20(DC)/B%20CASE/SPEC-EC5BE-V24.pdf DCDC-Converter CINCON EC6Cxx single output POE DCDC-Converter TRACO TMRxxxxWI Single/Dual_output DCDC-Converter, TRACO, TEN10-xxxx, https://assets.tracopower.com/20171102100522/TEN10/documents/ten10-datasheet.pdf DCDC-Converter TRACO TMR1-xxxx Dual_output DCDC-Converter, TRACO, TSR 1-xxxx XP_POWER IA48xxD, DIP, (https://www.xppower.com/pdfs/SF_IA.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 16 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp-16/CP_16_32.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py MSOP, 8 Pin (http://www.ti.com/lit/ds/symlink/tps62840.pdf#page=37), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 2 times 0.75 mm² wires, reinforced insulation, conductor diameter 0.65mm, outer diameter 2.3mm, size source Multi-Contact FLEXI-E 1.0 (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_noLead_generator.py QFN, 64 Pin (https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py TQFN, 24 Pin (https://www.st.com/resource/en/datasheet/led1642gw.pdf#page=37), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 40 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp-40/CP_40_15.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 2.5/4-H-5.0-EX Terminal Block, 1991040 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1991040), generated with kicad-footprint-generator Molex SPOX Connector System, 43045-1600 (alternative finishes: 43045-100x), 5 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13C-10P-1.25V%2851%29/), generated with kicad-footprint-generator Molex Pico-Lock series connector, B08B-ZESK-1D, with boss (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 24 Pin (https://www.st.com/resource/en/datasheet/stp16cp05.pdf#page=25), generated with kicad-footprint-generator Hirose DF13C SMD, CL535-0404-8-51, 4 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 Connector Phoenix Contact, SPT 2.5/11-V-5.0-EX 1732580 Connector Phoenix Contact, SPT 5/2-V-7.5 1738144 Connector Phoenix Contact connector footprint for: MCV_1,5/9-G-3.81; number of pins: 11; pin pitch: 5.00mm; Angled; threaded flange || order number: 1847660 8A 320V Generic Phoenix Contact connector footprint for: GMSTBV_2,5/8-GF-7,62; number of pins: 13; pin pitch: 5.08mm; Vertical || order number: 1757491 12A || order number: 1776634 12A Generic Phoenix Contact connector footprint for: GMSTBA_2,5/9-G-7,62; number of pins: 08; pin pitch: 5.08mm; Vertical; threaded flange || order number: 1847699 8A 320V Generic Phoenix Contact connector footprint for: MCV_1,5/3-GF-3.5; number of pins: 10; pin pitch: 5.08mm; Angled; threaded flange || order number: 1757242 12A || order number: 1924143 16A (HC Generic Phoenix Contact connector footprint for: MSTBVA_2,5/7-G; number of pins: 11; pin pitch: 3.50mm; Vertical; threaded flange || order number: 1847628 8A 320V Generic Phoenix Contact SPT.

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