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Arrangement; a challenging PCB and/or print job! See PDF at https://raw.githubusercontent.com/kassu/kassutronics/master/documentation/Quantizer/Quantizer_Build_Docs_1.1A.pdf for explanation about PWM smoothing; essentially a 4-stage RC network but with an eye towards doing it all in one module with WiFi, https://www.adafruit.com/product/2471 Arduino UNO R3, http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf 8devices Carambola2, OpenWRT, industrial SoM computer, https://www.8devices.com/media/products/carambola2/downloads/carambola2-datasheet.pdf Pololu Breakout 16-pin 15.2x20.3mm 0.6x0.8\ Raspberry Pi Zero using through hole M3, height 9, Wuerth electronics 9774025360 (https://katalog.we-online.de/em/datasheet/9774025360.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py WSON, 8 Pin, TI DRG, (http://www.ti.com/lit/ds/symlink/lp2951.pdf#page=27), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, 105313-xx02, 2 Pins per row (https://www.molex.com/pdm_docs/sd/430450221_sd.pdf), generated with kicad-footprint-generator XP_POWER ITXxxxxSA SIP DCDC-Converter XP_POWER IHxxxxSH, SIP, (https://www.xppower.com/pdfs/SF_IH.pdf), generated with kicad-footprint-generator JST PUD series connector, S02B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py Texas Instruments, BGA Microstar Junior, 2x2.5mm, 12 bump 4x3 grid, NSMD pad definition Appendix A BGA 484 0.8 RS484 Artix-7 BGA, 22x22 grid, 23x23mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=306.

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