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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 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 6, Wuerth electronics 9776100960 (https://katalog.we-online.com/em/datasheet/9776100960R.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-141-02-xxx-DV, 41 Pins per row (http://www.molex.com/pdm_docs/sd/428192214_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-112-02-xxx-DV-BE, 12 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-0730, 7 Pins (https://www.molex.com/pdm_docs/sd/026605050_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 2 times 2 mm² wires, reinforced insulation, conductor diameter 2.4mm, see http://www.4uconnector.com/online/object/4udrawing/19963.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix PTSM-0,5-6-2.5-H-THR, 6 pins, pitch 5.08mm, size 15.2x11.2mm^2, drill diamater 1.2mm, pad diameter 2.6mm, see http://www.mouser.com/ds/2/324/ItemDetail_1935161-922578.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00002, 3 pins, pitch 7.5mm, size 24.8x14mm^2, drill diamater 1.2mm, pad diameter 2.6mm, see http://www.farnell.com/datasheets/100425.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix PT-1,5-2-5.0-H, 2 pins, http://www.kingbright.com/attachments/file/psearch/000/00/00/L-483GDT(Ver.15B).pdf LED Round FlatTop diameter 5.0mm 3 pins diameter 5.0mm z-position of LED center 9.0mm, 2 pins LED, diameter 8.0mm, 3 pins LED, Round, FlatTop, Rectangular size 5.0x2.0mm^2 z-position of LED center 3.0mm 2 pins LED, diameter 3.0mm z-position of LED center 1.6mm 2 pins LED_Oval, Oval, Oval size 5.2x3.8mm^2 2 pins LED, diameter 5.0mm, 3 pins, pitch 3.5mm, size source Multi-Contact FLEXI-E 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 Hirose.

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