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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, wide, drill 0.75mm (see https://www.diodes.com/assets/Package-Files/TO92L.pdf and http://www.ti.com/lit/an/snoa059/snoa059.pdf TO-92L Molded Wide transistor TO-92L Molded Wide transistor TO-92L leads in-line (large body variant of 8-Lead Plastic DFN (3mm x 3mm); Pitch 0.4mm; EP 1.7x1.54mm; for InvenSense motion sensors; keepout area marked (Package see: https://store.invensense.com/datasheets/invensense/MPU9250REV1.0.pdf; See also https://www.invensense.com/wp-content/uploads/2015/02/InvenSense-MEMS-Handling.pdf 24-Lead Plastic Shrink Small Outline http://www.vishay.com/docs/49633/sg2098.pdf SOP, 16 Pin (https://www.st.com/resource/en/datasheet/tsv521.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502426-4010, 40 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0694-9-81&productname=DF12C(3.0)-50DS-0.5V(81)&series=DF12&documenttype=2DDrawing⟨=en&documentid=0000994748), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-132-02-xx-DV-PE-LC, 32 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 6-Lead Plastic Small Outline No-Lead 8-Lead Plastic Stretched Small Outline (SS)-5.30 mm Body [UDFN] (See http://www.onsemi.com/pub/Collateral/NLSV2T244-D.PDF dfn udfn dual flat OnSemi VCT, 28 Pin (http://www.ti.com/lit/ds/symlink/tps51363.pdf#page=29), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 28 Pin (http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/05081926_0_UDE28.pdf), generated with kicad-footprint-generator Molex KK-254 Interconnect System, old/engineering part number: 26-60-4150, 15 Pins (http://www.molex.com/pdm_docs/sd/559320210_sd.pdf), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: 26-60-5120, 12 Pins per row (http://www.molex.com/pdm_docs/sd/1053101208_sd.pdf), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: MCV_1,5/3-G-3.5; number of pins: 02; pin pitch: 3.81mm; Angled || order number: 1777167 12A || order number: 1829183 12A 630V Generic Phoenix Contact connector footprint for: MC_1,5/5-G-3.81; number of pins: 05; pin pitch: 3.81mm; Angled; threaded flange || order.

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