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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 2.6, Wuerth electronics 9776060960 (https://katalog.we-online.com/em/datasheet/9776060960.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py TSOP-I, 40 Pin (JEDEC MO-153 Var AB https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator connector Hirose DF13 through hole, DF11-30DP-2DSA, 15 Pins per row (http://suddendocs.samtec.com/prints/lshm-1xx-xx.x-x-dv-a-x-x-tr-footprint.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-1010, with PCB locator, 5 Pins per row (http://www.molex.com/pdm_docs/sd/431602102_sd.pdf), generated with kicad-footprint-generator Molex Pico-EZmate_Slim side entry Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-3210, 32 Pins per row (https://www.molex.com/pdm_docs/sd/022057045_sd.pdf), generated with kicad-footprint-generator connector JST EH series connector, 502585-1270 (http://www.molex.com/pdm_docs/sd/5025850270_sd.pdf), generated with kicad-footprint-generator JST PUD series connector, B05B-ZESK-D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Hirose DF63 through hole, DF13-12P-1.25DSA, 12 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Soldered wire.

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