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The full 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 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 (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot371-1_po.pdf STC SOP, 16 Pin (https://www.ti.com/lit/ml/msop002a/msop002a.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-125-02-xxx-DV-BE, 25 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 Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-102-02-xxx-DV-LC, 2 Pins per row (https://www.hirose.com/product/en/products/DF63/), generated with kicad-footprint-generator Molex CLIK-Mate series connector, B4B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator JST PUD series connector, B03B-XASK-1-A (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 53780-0370 (), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-132-02-xxx-DV-BE-LC, 32 Pins (http://www.molex.com/pdm_docs/sd/5024301410_sd.pdf), generated with kicad-footprint-generator LED SMD 1206 (3216 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 ipc_noLead_generator.py QFN, 56 Pin (JEDEC MO-153 Var AB https://www.jedec.org/document_search?search_api_views_fulltext=MO-194), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 64 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/00002304A.pdf (page 43)), generated with kicad-footprint-generator Molex Nano-Fit Power Connectors, old mpn/engineering number: 1-794374-x, 1 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 LY 20 series connector, BM02B-ZESS-TBT (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator connector Samtec side entry JST SUR series connector, B10B-ZESK-1D, with boss (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py UQFN, 20 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp-20/CP_20_8.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py 4-Lead Plastic Small Outline Narrow Body (QR)-.150" Body [QSOP] (see Microchip Packaging Specification 00000049BS.pdf QFN Microchip 8E 16 QFN, 44 Pin, dual row female, vertical entry, PN:G125-FVX1605L0X Harwin Gecko Connector, 10 pins, dual row female, vertical entry, PN:G125-FVX2005L0X Harwin Gecko Connector, 20 pins, through hole THT Omron Relay SPDT Omron Serie G6E 1x um Relay SPDT IM-relay HJR-4102 Omron Relay DPDT, http://www3.panasonic.biz/ac/e_download/control/relay/power/catalog/mech_eng_jw.pdf?via=ok Relay DPDT FRT5 narrow footprint Finder 32.21-x000 Relay, DPDT, https://gfinder.findernet.com/public/attachments/30/EN/S30EN.pdf AXICOM IM-Series Relays, DPDR, Pitch 3.2mm, http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Specification+Or+Standard%7F108-98001%7FV%7Fpdf%7FEnglish%7FENG_SS_108-98001_V_IM_0614_v1.pdf%7F4-1462039-1 AXICOM IM-Series Relay DPDR Pitch 3.2mm AXICOM IM-Series Relay DPDR Pitch 5.08 IM Signal Relay SPDT Omron Serie G6EK, see http://www.logosfoundation.org/instrum_gwr/pi/Omron_G6E_134P.pdf Relay SPDT Omron Serie G5Q, http://omronfs.omron.com/en_US/ecb/products/pdf/en-g5q.pdf Relay SPST-NO Omron Serie G5Q, http://omronfs.omron.com/en_US/ecb/products/pdf/en-g5q.pdf Relay SPDT HJR-4102 Relay SPDT High Capacity Relay, SPST-NO Form A, vertical mount, 6A, 5-60V, https://www.fujitsu.com/sg/imagesgig5/ftr-ly.pdf relay SPST-NO form A vertical Omron Relay, SPST, https://gfinder.findernet.com/assets/Series/355/S32EN.pdf Finder 32.21-x300 Relay, SPST, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Omron Relay DPDT, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Omron Relay, SPDT, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Omron Relay SPDT, Finder Type34.51, vertical/standing form, see https://gfinder.findernet.com/public/attachments/34/EN/S34USAEN.pdf Relay SPDT, Finder Type34.51, horizontal form, see https://gfinder.findernet.com/public/attachments/34/EN/S34USAEN.pdf Relay SPDT, http://www3.panasonic.biz/ac/e_download/control/relay/power/catalog/mech_eng_jw.pdf?via=ok Relay DPDT Finder 40.51, Pitch 5mm/7.5mm.

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