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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 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 Mallory low-profile piezo buzzer, https://mspindy.com/spec-sheets/AST1109MLTRQ.pdf 5.5V, 470mF supercapacitor, 45mohm, -40ºC to +70ºC, https://www.cap-xx.com/wp-content/uploads/datasheets/CAP-XX-DMF470mF-Datasheet.pdf Cliff single 4mm shrouded banana panel socket, through-hole, row spacing 10.16 mm (400 mils), LongPads 64-lead though-hole mounted DIP package, row spacing 11.48 mm (451 mils 24-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils), Socket 16-lead though-hole mounted DIP package, row spacing 15.24 mm (600 mils), Socket, LongPads THT DIP DIL PDIP 2.54mm 25.4mm 1000mil SMDSocket SmallPads 4-lead though-hole mounted DIP package, row spacing 25.4 mm (1000 mils), Socket, LongPads THT DIP DIL PDIP 2.54mm 25.4mm 1000mil Socket 3M 28-pin zero insertion force socket, through-hole, row spacing 16.51 mm (650 mils), SMDSocket, LongPads THT DIP DIL PDIP 2.54mm 10.16mm 400mil SMDSocket SmallPads 40-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), LongPads 10-lead though-hole mounted DIP package, row spacing 22.86 mm (900 mils), LongPads 14-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), body size 6.7x26.96mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/219.pdf), SMD, LowProfile SMD 12x-dip-switch SPST , Slide, row spacing 9.53 mm (375 mils), Clearance8mm 10-lead surface-mounted (SMD) DIP package, row spacing 6.73 mm (264 mils), body size (see https://www.ctscorp.com/wp-content/uploads/194-195.pdf 12x-dip-switch SPST , Slide, row spacing 10.16 mm (400 mils), Socket, LongPads 18-lead though-hole mounted DIP package, row spacing 10.16 mm (400 mils 6-lead though-hole mounted DIP package, row spacing 8.89 mm (350 mils), body size 6.7x14.26mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/206-208.pdf 12x-dip-switch SPST , Slide, row spacing 7.62 mm (300 mils), body size (see https://www.ctscorp.com/wp-content/uploads/194-195.pdf 10x-dip-switch SPST Omron_A6H-10101, Slide, row spacing 8.61 mm (338.

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