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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 3.3mm, height 4, Wuerth electronics 97730606334 (https://katalog.we-online.com/em/datasheet/97730606334.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SO, 24 Pin (http://www.ti.com/lit/ds/symlink/msp430f1101a.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LFCSP, 32 Pin (http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/QFN_32_05-08-1693.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 32 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/00002164B.pdf#page=68), generated with kicad-footprint-generator JST XA series connector, SM14B-GHS-TB (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Hirose DF13 vertical Hirose DF12C SMD, DF12C3.0-20DS-0.5V, 20 Pins per row.

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