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BackFor 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 (http://www.nve.com/Downloads/ab3.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSSOP, 28 Pin (JEDEC MO-153 Var AB https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 40 Pin (https://www.nxp.com/docs/en/package-information/SOT618-1.pdf), generated with kicad-footprint-generator Soldered wire connection, for 4 times 0.127 mm² wires, basic insulation, conductor diameter 0.48mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-E/HK 0.127 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Inductor SMD 0603 (1608 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: IPC-SM-782 page 72, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SOIC, 20 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0108.PDF U20E-1), generated with kicad-footprint-generator Mounting Hardware, inside through hole M2, height.
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