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BackDAC 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, wide, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot190-1_po.pdf VSSOP-8 2.3x2mm Pitch 0.5mm vertical Molex KK-254 Interconnect System, old/engineering part number: A-41792-0008 example for new mpn: 39-29-4229, 11 Pins (http://www.molex.com/pdm_docs/sd/022272021_sd.pdf), generated with kicad-footprint-generator Hirose DF11 through hole, DF11-10DP-2DSA, 5 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13C-10P-1.25V%2851%29/), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 42820-52XX, With thermal vias 10-Lead Plastic WSON, 2x2mm Body, 0.5mm Pitch, https://www.st.com/resource/en/datasheet/stm32mp151a.pdf ST UFBGA-73, 5.0x5.0mm, 73 Ball, 9x9 Layout, 0.4mm Pitch, https://assets.nexperia.com/documents/data-sheet/PCMFXUSB3S_SER.pdf ST WLCSP-18, ST Die ID 466, 1.86x2.14mm, 18 Ball, X-staggered 13x8 Layout, 0.4mm Pitch, YFF0006, NSMD pad definition Appendix A BGA 484 0.8 RS484 Artix-7 BGA, 22x22 grid, 19x19mm package, 0.8mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=270, NSMD pad definition (http://www.ti.com/lit/ds/symlink/ts5a3159a.pdf Texas Instruments EUW 7 Pin Double Sided Module Texas Instruments HSOP 9, 1.27mm pitch, double rows Surface mounted pin header THT 1x03 1.27mm single row Surface mounted socket strip THT 1x21 1.27mm single row style2 pin1 right Through hole angled.
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