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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 integral chip antenna (http://ww1.microchip.com/downloads/en/DeviceDoc/60001380C.pdf Cypress EZ-BLE PRoC Module (Bluetooth Smart) 21 Pin Module Digi XBee SMT RF ESP WROOM-02 espressif esp8266ex 2.4 GHz Wi-Fi and Bluetooth combo chip with U.FL connector, https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf D52M ANT SoC Module https://www.thisisant.com/assets/resources/D00001687_D52_Module_Datasheet.v.2.3_(Garmin).pdf RF SoC Radio ANT Bluetooth BLE D52 nRF52 Garmin Canada Dynastream Nordic Low Power Long Range Transceiver Module rf module lora lorawan Multiprotocol radio SoC module https://www.raytac.com/download/index.php?index_id=43 wireless 2.4 GHz Wi-Fi Bluetooth external antenna espressif 15.4*15.4mm ESP32-S2-WROVER(-I) 2.4 GHz Bluetooth ble zigbee 802.15.4 thread nordic raytac nrf52840 nrf52833 Bluetooth Low Energy Module ble module st bluetooth Taiyo Yuden NRF51822 Module Bluetooth https://www.yuden.co.jp/wireless_module/document/datareport2/en/TY_BLE_EYSGJNZ_DataReport_V1_9_20180530E.pdf Taiyo Yuden NRF51822 Module Bluetooth https://www.yuden.co.jp/wireless_module/document/datareport2/en/TY_BLE_EYSGJNZ_DataReport_V1_9_20180530E.pdf Taiyo Yuden NRF51822 Module Bluetooth RF transceiver SMD style https://www.rfsolutions.co.uk/downloads/1456219226DS-ZETA.pdf Laird Technologies BMI-S-102 Shielding Cabinet One Piece SMD 32.00x32.00mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-208-F Shielding Cabinet SMD 25x25mm WE-SHC Shielding Cabinet SMD 50x50mm WE-SHC Shielding Cabinet SMD 50x50mm WE-SHC Shielding Cabinet Two Piece SMD 36.83x33.68mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies 97-2002 EZ PEEL Shielding Cabinet One Piece SMD 36.83x33.68mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-230-F Shielding Cabinet THT 61x61mm Signal Relay, 10x6mm, 2 Form C, vertical mount, 6A, 5-60V, https://www.fujitsu.com/sg/imagesgig5/ftr-ly.pdf relay SPST-NO form A vertical Omron Relay, SPDT, High Capacity, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Omron Relay, DPDT, https://gfinder.findernet.com/public/attachments/30/EN/S30EN.pdf AXICOM IM-Series Relay DPDR Pitch 3.2mm AXICOM IM-Series Relay DPDT Finder 40.52, Pitch 5mm/7.5mm, https://www.finder-relais.net/de/finder-relais-serie-40.pdf Relay DPDT Finder 40.52 Pitch 5mm relay dpdt fujitsu tht Relay DPST Schrack-RT2 RM5mm 16A 250V AC Relay Relay SPST Schrack-RT2 RM5mm 16A 250V AC Relay Standex-Meder SIL-relais, Form 1B, see https://standexelectronics.com/wp-content/uploads/datasheet_reed_relay_SIL.pdf Standex-Meder SIL-relais, UMS, see http://cdn-reichelt.de/documents/datenblatt/C300/UMS05_1A80_75L_DB.pdf Resistor SMD 1218 (3246 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator JST XA series connector, B2B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-124-02-xxx-DV, 24 Pins (http://www.molex.com/pdm_docs/sd/908140004_sd.pdf), generated with kicad-footprint-generator JST ZE series connector, SM20B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py DFN, 8 Pin (http://www.ti.com/lit/ds/symlink/lm5017.pdf#page=31), generated with kicad-footprint-generator Molex Mini-Universal MATE-N-LOK, old mpn/engineering number: 1-770969-x, 3 Pins (http://www.molex.com/pdm_docs/sd/559350530_sd.pdf), generated with kicad-footprint-generator Molex CLIK-Mate series connector, 53780-1570 (), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 2 times 2.5 mm² wires, reinforced insulation, conductor diameter 0.65mm, outer diameter 2mm, size source Multi-Contact FLEXI-E/HK 0.127 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Hirose DF11 through hole, DF11-16DP-2DSA, 8 Pins (https://www.molex.com/pdm_docs/sd/026605050_sd.pdf), generated with kicad-footprint-generator Molex MicroClasp side entry JST.

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