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Dev board (in 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 EPCOS app note at http://www.cypress.com/file/140006/download DFN, 6 Pin (https://www.ti.com/lit/ds/symlink/sn74auc1g04.pdf#page=24), Solder Mask Defined VSON, 8 Pin (https://docs.broadcom.com/doc/APDS-9251-001-DS#page=19), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 3 times outer diameter, generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-2104, With thermal vias in pads, 4 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 Resistor SMD 0805 (2012 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: http://www.vishay.com/docs/20056/crcw01005e3.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 16 Pin (https://www.stcmicro.com/datasheet/STC15F2K60S2-en.pdf#page=156), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 42819-52XX, With thermal vias in pads, 3 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 Pico-SPOX Connector System, 53048-0410, 4 Pins per row (https://www.molex.com/pdm_docs/sd/430450221_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 20 Pin (JEDEC MO-153 Var BC-1 https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-108-02-xxx-DV-BE-LC, 8 Pins (https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=826576&DocType=Customer+Drawing&DocLang=English), generated with kicad-footprint-generator JST ZE series connector, SM08B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator connector Molex Pico-EZmate side entry Molex Mini-Universal MATE-N-LOK, old mpn/engineering number: 5569-20A1, example for new part number: 09-65-2108, 10 Pins per row (https://www.hirose.com/product/document?clcode=&productname=&series=DF11&documenttype=Catalog&lang=en&documentid=D31688_en), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, AFC07-S06FCA-00, 6 Pins (http://www.molex.com/pdm_docs/sd/908140004_sd.pdf), generated with kicad-footprint-generator Molex PicoBlade Connector System, 43045-0821 (alternative finishes: 43045-062x), 3 Pins per row, Mounting: (http://www.molex.com/pdm_docs/sd/039281043_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-135-02-xxx-DV-BE-A, 35 Pins per row, Mounting: PCB Mounting Flange (http://www.molex.com/pdm_docs/sd/039291047_sd.pdf), generated with kicad-footprint-generator Molex SPOX Connector System, 53048-1010, 10 Pins (http://www.molex.com/pdm_docs/sd/903250004_sd.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 504050-0591 (http://www.molex.com/pdm_docs/sd/5040500891_sd.pdf), generated with kicad-footprint-generator JST XH series connector, DF52-4S-0.8H (https://www.hirose.com/product/en/products/DF52/DF52-3S-0.8H%2821%29/), generated with kicad-footprint-generator JST GH top entry Molex PicoBlade Connector System, 43045-0400 (alternative finishes: 43045-060x), 3 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 JST PH series connector, B06B-JWPF-SK-R (http://www.jst-mfg.com/product/pdf/eng/eJWPF1.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, S32B-PHDSS (http://www.jst-mfg.com/product/pdf/eng/ePHD.pdf), generated with kicad-footprint-generator Molex KK-254 Interconnect.

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