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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 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 3.3mm, height 9, Wuerth electronics 9771150360 (https://katalog.we-online.com/em/datasheet/9771150360.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-113-02-xxx-DV-BE, 13 Pins per row (http://www.molex.com/pdm_docs/sd/1053131208_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSSOP28: plastic thin shrink small outline package; 16 leads; body width 3.9 mm; lead pitch 0.635; (see NXP sot054_po.pdf TO-126-2, Horizontal, RM 5.45mm, see https://www.fairchildsemi.com/package-drawings/TO/TO264A03.pdf TO-264-3 Vertical RM 1.27mm staggered type-1 TO-220-5, Horizontal, RM 2.54mm, staggered type-1 TO-220F-7 Vertical RM 1.7mm PentawattF- MultiwattF-5 staggered type-1 TO-220-4, Vertical, RM 0.97mm, Multiwatt-9, staggered type-2 TO-220-4 Vertical RM 1.7mm Pentawatt Multiwatt-5 staggered type-2 TO-220-7, Horizontal, RM 1.7mm, Pentawatt, Multiwatt-5, staggered type-2, see http://www.st.com/resource/en/datasheet/tda7391lv.pdf TO-220-11 Horizontal RM 1.27mm Multiwatt-7 staggered type-1 TO-220-4, Horizontal, RM 5.475mm, SOT-93, see https://www.vishay.com/docs/95214/fto218.pdf TO-218-2 Horizontal RM 5.08mm TO-126-2, Vertical, RM 1.7mm, MultiwattF-11, staggered type-2, see http://www.st.com/resource/en/datasheet/tda7391lv.pdf TO-220-11 Vertical RM 2.54mm TO-220F-4, Horizontal, RM 0.97mm, Multiwatt-9, staggered type-1 TO-220-8 (Multiwatt8), Vertical, 2.54mm Pitch (http://www.st.com/resource/en/datasheet/tda7264.pdf TO-220-9 Vertical 2.54mm Pitch Multiwatt 8 TO-220-9, Vertical, RM 1.7mm, staggered type-1, see http://www.st.com/resource/en/datasheet/tda7391lv.pdf TO-220-11 Vertical RM 1.27mm Multiwatt-7 staggered type-1 TO-220-4, Vertical, RM 0.97mm, Multiwatt-9, staggered type-1 TO-220F-9 Vertical RM 0.9mm staggered type-1 TO-220F-2, Horizontal, RM 2.54mm, see http://ww1.microchip.com/downloads/en/DeviceDoc/20005685A.pdf TO-247-5 Vertical RM 1.27mm staggered type-2 TO-220-4 Vertical RM 10.9mm TO-264-3, Horizontal, RM 5.08mm, see http://www.onsemi.com/pub/Collateral/FFPF10F150S-D.pdf TO-220F-2 Vertical RM 10.9mm TO-247-3, Horizontal, RM 2.29mm, IPAK, see https://www.diodes.com/assets/Package-Files/TO251.pdf TO-251-2 Horizontal RM 2.54mm staggered type-1 TO-220-9 Horizontal RM 1.27mm MultiwattF-15 staggered type-2 TO-220-4 Horizontal RM 2.54mm TO-220-4, Horizontal, RM 1.27mm, staggered type-1, see http://www.st.com/resource/en/datasheet/tda7391lv.pdf TO-220-11 Vertical RM 1.7mm IIPAK I2PAK TO-262-3, Vertical, RM 2.54mm, staggered type-1, see http://www.ti.com/lit/ds/symlink/lmd18200.pdf TO-220-15, Vertical, RM 5.08mm, see http://www.onsemi.com/pub/Collateral/FFPF10F150S-D.pdf TO-220F-2 Horizontal RM 2.54mm TO-218-2, Horizontal, RM 2.54mm, staggered type-2, see http://www.st.com/resource/en/datasheet/l298.pdf TO-220-15 Vertical RM 1.27mm Multiwatt-7 staggered type-2 TO-220F-15 Vertical RM 1.7mm PentawattF- MultiwattF-5 staggered type-2 TO-220-7 Vertical RM 2.54mm TO-247-4, Vertical, RM 1.7mm, IIPAK, I2PAK, see http://pdf.datasheetcatalog.com/datasheet/irf/iris4011.pdf TO-262-5 Vertical RM 1.27mm MultiwattF-15 staggered type-1 TO-220F-2, Horizontal, RM 1.27mm, Multiwatt-7, staggered type-1 TO-220-7 Horizontal RM 0.97mm Multiwatt-9 staggered type-2.

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