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Other material in 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 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 M2, height 4, Wuerth electronics 9774070482 (https://katalog.we-online.de/em/datasheet/9774070482.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-6410, 64 Pins (http://www.molex.com/pdm_docs/sd/5024260810_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py LGA 24L 3x3.5mm Pitch 0.43mm LGA 28 5.2x3.8mm Pitch 0.5mm VSSOP DCU R-PDSO-G8 Pitch0.5mm VSSOP-8 3.0 x 2.0mm, orientation marker at anode, https://dammedia.osram.info/media/resource/hires/osram-dam-5824137/SFH%204257_EN.pdf LED PLCC-2 SMD TOPLED LED PLCC-2 SMD TOPLED LED PLCC-2 SMD package, http://www.infineon.com/cms/en/product/packages/PG-TO252/PG-TO252-5-11/ TO-263/D2PAK/DDPAK SMD package, http://www.icbank.com/icbank_data/semi_package/to268aa_dim.pdf D3PAK TO-268 D3PAK-3 TO-268-3 SMD package RGB LED NeoPixel Nano, 12 mA, https://cdn-shop.adafruit.com/product-files/4684/4684_WS2812B-2020_V1.3_EN.pdf LED RGB Chip SMD LED SMD right angle tactile switch Wurth Wuerth Ultraminiature Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-7811045, 10 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 JST VH series connector, LY20-24P-DLT1, 12 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ038187.pdf), generated with kicad-footprint-generator JST SH series connector, 64800311622 (https://katalog.we-online.com/em/datasheet/6480xx11622.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.25mm, height 4.5, Wuerth electronics 9774050960 (https://katalog.we-online.de/em/datasheet/9774050960.pdf,), generated with kicad-footprint-generator ipc_noLead_generator.py QFN.

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