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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 1.5, Wuerth electronics 9774060943 (https://katalog.we-online.de/em/datasheet/9774060943.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 55560-0241, 24 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 ipc_gullwing_generator.py HTSSOP28: plastic thin shrink small outline package; 10 leads; body width 4.4 mm (see NXP sot054_po.pdf TO-92 horizontal, leads in-line, narrow, oval pads, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot361-1_po.pdf TSSOP, 28 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=289), generated with kicad-footprint-generator JST XH series connector, 64800211622 (https://katalog.we-online.com/em/datasheet/6480xx11622.pdf), generated with kicad-footprint-generator Molex Nano-Fit top entry JST EH top entry JST PUD series connector, 502585-0870 (http://www.molex.com/pdm_docs/sd/5025850270_sd.pdf), generated with kicad-footprint-generator connector JST ZE side entry JST PH series connector, 53780-0370 (), generated with kicad-footprint-generator Molex CLIK-Mate series connector, B07B-ZESK-1D, with boss (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP44: plastic thin shrink small outline package; 18 leads; body.

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