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BackPDF 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 2.25mm, height 3, Wuerth electronics 9775116360 (https://katalog.we-online.com/em/datasheet/9775116360.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-4010, 40 Pins (http://www.molex.com/pdm_docs/sd/547220804_sd.pdf), generated with kicad-footprint-generator crystal Epson Toyocom TSX-3225 series https://support.epson.biz/td/api/doc_check.php?dl=brief_fa-238v_en.pdf, hand-soldering, 3.2x2.5mm^2 package crystal Epson Toyocom FA-238 series https://support.epson.biz/td/api/doc_check.php?dl=brief_fa-238v_en.pdf, hand-soldering, 3.2x2.5mm^2 package SMD Crystal EuroQuartz MT series http://cdn-reichelt.de/documents/datenblatt/B400/MT.pdf, 3.2x2.5mm^2 package Miniature Crystal Clock Oscillator ECS 2520MV series, https://www.ecsxtal.com/store/pdf/ECS-2520MV.pdf Miniature Crystal Clock Oscillator IQXO-70, http://www.iqdfrequencyproducts.com/products/details/iqxo-70-11-30.pdf, hand-soldering, 19.9x12.9mm^2 package Miniature Crystal Clock Oscillator EuroQuartz XO32 series, http://cdn-reichelt.de/documents/datenblatt/B400/XO32.pdf, hand-soldering, 3.2x2.5mm^2 package SMD Crystal SERIES SMD2520/2 http://www.icbase.com/File/PDF/HKC/HKC00061008.pdf, 5.0x3.2mm^2 package SMD Crystal EuroQuartz EQ161 series http://cdn-reichelt.de/documents/datenblatt/B400/PG32768C.pdf, 3.2x1.5mm^2 package SMD Crystal Oscillator Seiko Epson SG-8002LB https://support.epson.biz/td/api/doc_check.php?mode=dl&lang=en&Parts=SG-8002DC, 5.0x3.2mm^2 package 14-lead dip package, row spacing 8.9 mm (350 mils), SMDSocket, SmallPads 28-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils 28-lead though-hole mounted DIP package, row spacing 9.53 mm (375 mils 12-lead surface-mounted (SMD) DIP package, row spacing 15.24 mm (600 mils), Socket THT DIP DIL PDIP 2.54mm 10.16mm 400mil 4-lead though-hole mounted DIP package, row spacing 16.51 mm (650 mils), SMDSocket, LongPads THT DIP DIL PDIP 2.54mm 22.86mm 900mil LongPads 64-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), Socket, LongPads 28-lead though-hole mounted DIP package, row spacing 22.86 mm (900 mils), SMDSocket, LongPads 8-lead though-hole mounted DIP package, row spacing 7.62.
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