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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 Molex Mini-Fit Jr. Power Connectors, old mpn/engineering number: 1-770870-x, 3 Pins per row (https://www.molex.com/pdm_docs/sd/022057045_sd.pdf), generated with kicad-footprint-generator JST J2100 series connector, 202396-0307 (http://www.molex.com/pdm_docs/sd/2023960207_sd.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 52991-0808, 80 Pins (http://www.molex.com/pdm_docs/sd/555600207_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py TQFN, 24 Pin (http://www.ti.com/lit/ds/symlink/bq24133.pdf#page=40 Texas Instruments, DSBGA, 3.33x3.488x0.625mm, 49 ball 7x7 area grid, NSMD pad definition Appendix A Artix-7 BGA, 18x18 grid, 15x15mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=297, NSMD pad definition Appendix A BGA 400 0.8 CLG400 CL400 Zynq-7000 BGA, 26x26 grid, 27x27mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=306, NSMD pad definition (http://www.ti.com/lit/ds/symlink/txb0102.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments EUS 5 Pin Double Sided Module 16-pin module, column spacing 22.86 mm (900 mils), SMDSocket, SmallPads 10-lead though-hole mounted DIP package, row spacing 8.61 mm (338 mils), body size (see http://www.kingtek.net.cn/pic/201601201446313350.pdf), JPin SMD 4x-dip-switch SPST , Slide, row spacing 26.67 mm (1050 mils), SMDSocket, SmallPads.

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