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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 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 M1.6, height 4.5, Wuerth electronics 97730506334 (https://katalog.we-online.com/em/datasheet/97730506334.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, B2B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Soldered wire connection, for 5 times 0.25 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 1mm, size source Multi-Contact FLEXI-E 0.1 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 4 times 1 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 2.7mm, size source Multi-Contact FLEXI-xV 0.75 (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 SHL series connector, LY20-18P-DT1, 9 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 16 Pin (Allegro A4954 https://www.allegromicro.com/-/media/Files/Datasheets/A4954-Datasheet.ashx), generated with kicad-footprint-generator connector wire 0.75sqmm strain-relief Soldered wire connection, for 2 times 0.75 mm² wires, basic insulation, conductor diameter 0.48mm, outer diameter 1mm, size source Multi-Contact FLEXI-xV 1.0 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_gullwing_generator.py Plastic Small Outline (SN) - Narrow, 3.90 mm Body [DFN] (http://www.onsemi.com/pub/Collateral/NCP4308-D.PDF DD Package; 8-Lead Plastic DFN (3mm x 2mm) (see Linear Technology DFN_8_05-08-1702.pdf 8-Lead Plastic Small Outline (SN) - Narrow, 3.90 mm Body [LFCSP], (see http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp_20_6.pdf LFCSP, 20 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0140.PDF.

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