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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 R2, http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf Arduino UNO R2, http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf 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 3.6, Wuerth electronics 9774010943 (https://katalog.we-online.de/em/datasheet/9774010943.pdf), generated with kicad-footprint-generator Hirose DF11 through hole, DF11-8DP-2DSA, 4 Pins (http://www.molex.com/pdm_docs/sd/559320210_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 6, Wuerth electronics 9775036360 (https://katalog.we-online.com/em/datasheet/9775036360.pdf), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, FH12-16S-0.5SH, 16 Pins (http://www.molex.com/pdm_docs/sd/022272021_sd.pdf), generated with kicad-footprint-generator connector wire 1.5sqmm strain-relief Soldered wire connection, for 2 times 0.5 mm² wires, basic insulation, conductor diameter 1.4mm, outer diameter 1mm, size source Multi-Contact FLEXI-E 0.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator connector wire 0.5sqmm strain-relief Soldered wire connection, for 5 times 2.5 mm² wires, reinforced insulation, conductor diameter 1.4mm, outer diameter 1.7mm, outer diameter 2mm, size source Multi-Contact FLEXI-E/HK 0.127 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator JST VH series connector, 14110913002xxx (https://b2b.harting.com/files/download/PRD/PDF_TS/1411XX13002XXX_100228421DRW035C.pdf), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 42820-52XX, With thermal vias in pads, 4 Pins per row (http://www.molex.com/pdm_docs/sd/530470610_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-122-02-xxx-DV-BE-A, 22 Pins per row (http://www.molex.com/pdm_docs/sd/431605304_sd.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 53748-0708, 70 Pins (http://www.molex.com/pdm_docs/sd/529910308_sd.pdf), generated with kicad-footprint-generator Fuse SMD 2920 (7451 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: http://www.kemet.com/Lists/ProductCatalog/Attachments/253/KEM_TC101_STD.pdf), generated with kicad-footprint-generator SIM Card, Push-Push, https://www.jae.com/direct/topics/topics_file_download/topics_id=68892&ext_no=06&index=0&_lang=en&v=202003111511468456809 SIM Card with Detect Switch JST ACH series connector, DF52-14S-0.8H (https://www.hirose.com/product/en/products/DF52/DF52-3S-0.8H%2821%29/), generated with kicad-footprint-generator Molex Micro-Fit 3.0 Connector System, 5268-05A, 5 Pins per row (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=82181_SOFTSHELL_HIGH_DENSITY&DocType=CS&DocLang=EN), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502426-6010, 60 Pins (http://www.molex.com/pdm_docs/sd/5024260810_sd.pdf), generated with kicad-footprint-generator.

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