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A ring 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 15, Wuerth electronics 9774080951 (https://katalog.we-online.de/em/datasheet/9774080951.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 76 Pin (https://www.marvell.com/documents/bqcwxsoiqfjkcjdjhkvc/#page=19), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 10, Wuerth electronics 9774070482 (https://katalog.we-online.de/em/datasheet/9774070482.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 14, Wuerth electronics 9775051360 (https://katalog.we-online.com/em/datasheet/9775051360.pdf), generated with kicad-footprint-generator Hirose series connector, B4B-XH-AM, with boss (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-0430, 4 Pins per row (https://www.molex.com/pdm_docs/sd/430450201_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-141-02-xxx-DV-BE-A, 41 Pins per row (http://www.molex.com/pdm_docs/sd/431600105_sd.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-1430, 14 Pins per row (http://www.molex.com/pdm_docs/sd/1053141208_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 28 Pin (package code T2844-1; https://pdfserv.maximintegrated.com/package_dwgs/21-0139.PDF), generated with kicad-footprint-generator JST EH series connector, B13B-XASK-1-A (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator Molex 734 Male header (for PCBs); Angled solder pin 1 x 1 mm, 734-178 , 18 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Hirose DF12E SMD, DF12E3.0-50DP-0.5V, 50 Pins per row, Mounting: (http://www.molex.com/pdm_docs/sd/039281043_sd.pdf), generated with kicad-footprint-generator JST EH series connector, LY20-44P-DT1, 22 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ038187.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSSOP, 20 Pin (https://www.holtek.com/documents/10179/116723/sop20-300.pdf), generated with kicad-footprint-generator JST XA series connector, S12B-XH-A-1 (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, old mpn/engineering number: 5566-22A.

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