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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 93 (https://www.catagle.com/45-2/PDF_AN93.htm Bourns TBU-CA Fuse, 2 Pin (https://www.bourns.com/data/global/pdfs/TBU-CA.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-145-02-xxx-DV-BE-A, 45 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 DF12E SMD, DF12E3.0-32DP-0.5V, 32 Pins per row (http://www.molex.com/pdm_docs/sd/530470610_sd.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 502494-1270 (http://www.molex.com/pdm_docs/sd/5024940270_sd.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, S20B-J21DK-GGXR (http://www.jst-mfg.com/product/pdf/eng/eJFA-J2000.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py mlf 8 2x2 mm 16-Lead Quad Flat, No Lead Package - 9x9 mm Body [DFN] (see Microchip Packaging Specification 00000049BS.pdf UQFN, 16 Pin (https://www.onsemi.com/pub/Collateral/FUSB307B-D.PDF#page=56), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 28 Pin (http://www.onsemi.com/pub/Collateral/601AE.PDF), generated with kicad-footprint-generator Molex PicoBlade series connector, 53261-1571 (http://www.molex.com/pdm_docs/sd/532610271_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 46 Pin (http://www.ti.com/lit/ds/symlink/lp5036.pdf#page=59), generated with kicad-footprint-generator Molex Picoflex Ribbon-Cable Connectors, 90814-0004, 4 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf.

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