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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 leads in-line, narrow, oval pads, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92 leads in-line, wide, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot158-1_po.pdf VSO56: plastic very small outline package; 44 leads; body width 4.4 mm; thermal pad with vias HTSSOP, 20 Pin (JEDEC MS-013AE, https://www.analog.com/media/en/package-pcb-resources/package/35833120341221rw_28.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SOIC, 18 Pin (https://toshiba.semicon-storage.com/info/docget.jsp?did=30523), generated with kicad-footprint-generator Hirose DF11 through hole, DF63R-3P-3.96DSA, 3 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Hirose DF13 through hole, DF11-26DP-2DSA, 13 Pins per row (https://www.molex.com/pdm_docs/sd/430450201_sd.pdf), generated with kicad-footprint-generator Molex 0.50mm Pitch Easy-On BackFlip Type FFC/FPC, 502250-4191, 41 Circuits (http://www.molex.com/pdm_docs/sd/5022504191_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py MLPQ 32 leads, 7x7mm, 0.127mm stencil (https://www.infineon.com/dgdl/ir4302.pdf?fileId=5546d462533600a4015355d602a9181d, https://www.infineon.com/dgdl/Infineon-AN1170-AN-v05_00-EN.pdf?fileId=5546d462533600a40153559ac3e51134 14-Lead Plastic DFN (2mm x 2mm) (see Linear Technology DFN_14_05-08-1708.pdf DFN14, 4x4, 0.5P; CASE 505AB (see ON Semiconductor 932BH.PDF TQFP, 64 Pin (JEDEC MO-153 Var AD https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator JST ZE series connector, BM11B-ZESS-TBT (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Molex Mini-Universal MATE-N-LOK, old mpn/engineering number: 5569-22A1, example for new part number: AE-6410-14A example for new part number: 26-60-5040, 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 Soldered wire connection, for 2 times 1 mm² wires, basic insulation, conductor diameter 0.65mm, outer diameter 2.3mm, 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 0.25 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 2.7mm, size source Multi-Contact FLEXI-E 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 Molex Mini-Fit Jr. Power Connectors, 42819-32XX, With thermal vias in pads, 5 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 Tantalum Capacitor SMD Kemet-E (7360-38 Metric), IPC_7351 nominal, (Body size source: https://www.vishay.com/docs/20052/crcw0201e3.pdf), generated with kicad-footprint-generator Hirose DF13 through hole, DF11-4DP-2DSA, 2 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 Mounting Hardware, inside through hole 2.7mm, height 1.5, Wuerth electronics 9771070360 (https://katalog.we-online.com/em/datasheet/9771070360.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 16 Pin (https://assets.nexperia.com/documents/data-sheet/74HC_HCT165.pdf#page=14), generated with kicad-footprint-generator Hirose DF13 through hole, DF13-11P-1.25DSA, 11 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 TQFN, 24 Pin (https://www.nxp.com/docs/en/package-information/SOT616-3.pdf), generated with kicad-footprint-generator JST SH series connector, LY20-40P-DT1, 20 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ038187.pdf), generated with.

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