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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 3.2mm, height 5.1, Wuerth electronics 9774070960 (https://katalog.we-online.de/em/datasheet/9774070960.pdf,), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-138-02-xxx-DV, 38 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0834-6-81&productname=DF12E(3.0)-50DP-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000992393), generated with kicad-footprint-generator ipc_gullwing_generator.py SOIC, 28 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=289), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 4 times 2.5 mm² wires, basic insulation, conductor diameter 0.65mm, outer diameter 3.5mm, size 29x8.3mm^2, drill diamater 1.2mm, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00018 pitch 5mm size 20x8.1mm^2 drill 1.1mm pad 2.2mm.

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