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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 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 module, https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf 2.4 GHz Wi-Fi and Bluetooth combo chip, external antenna, https://www.espressif.com/sites/default/files/documentation/esp32-s3-mini-1_mini-1u_datasheet_en.pdf 2.4 GHz Wi-Fi Bluetooth external antenna espressif 15.4*15.4mm ESP32-S2-WROVER(-I) 2.4 GHz Wi-Fi and Bluetooth combo chip Single 2.4 GHz Wi-Fi Bluetooth external antenna espressif 20*15.4mm 2.4 GHz Wi-Fi Bluetooth external antenna espressif 15.4*15.4mm ESP32-S2-WROVER(-I) 2.4 GHz Wi-Fi and Bluetooth module, https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf NINA-B111 LGA module 42 Pin https://content.u-blox.com/sites/default/files/NINA-B1_DataSheet_UBX-15019243.pdf#page=30 NINA ublox u-blox b111 bluetooth nrf52840 module Omron Relay, SPST, High Capacity, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Omron G5V-2 Relay DPDT Finder 40.31 Pitch 3.5mm Relay DPDT Finder 40.51 Pitch 5mm IM Signal Relay DPDT IM-relay FRT5 Kemet signal relay, DPDT, non-latching, single coil latching through hole 3.3mm, height 1.5, Wuerth electronics 9774090951 (https://katalog.we-online.de/em/datasheet/9774090951.pdf), generated with kicad-footprint-generator connector Molex Pico-Clasp series connector, SM03B-GHS-TB (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-147-02-xx-DV-TE, 47 Pins per row (http://www.molex.com/pdm_docs/sd/530470610_sd.pdf), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, 105310-xx16, 8 Pins (https://www.molex.com/pdm_docs/sd/009652028_sd.pdf), generated with kicad-footprint-generator Diode SMD 2512 (6332 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering.

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