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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-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, DPDT, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Omron Relay, SPST, High Capacity, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Omron Relay, SPDT, https://gfinder.findernet.com/assets/Series/355/S32EN.pdf Relay SPDT, Finder Type34.51, horizontal form, see https://gfinder.findernet.com/public/attachments/34/EN/S34USAEN.pdf Hamamatsu spectrometer, see http://www.hamamatsu.com/resources/pdf/ssd/c12880ma_kacc1226e.pdf 3.2mmx2.7mm, light sensor, i2c interface, 6-pin chipled package, https://docs.broadcom.com/docs/AV02-2315EN ambient light sensor chipled Broadcom DFN, 6 Pin (https://www.silabs.com/documents/public/data-sheets/Si7020-A20.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py 6-Lead Plastic Dual Flat, No Lead Package - 4.0x4.0x0.8 mm Body [TSSOP] with exposed pad (http://cds.linear.com/docs/en/datasheet/34301fa.pdf SSOP 0.65 exposed pad (http://www.onsemi.com/pub/Collateral/NCP4308-D.PDF WDFN, 12 Pin Placed - Wide, 7.50 mm Body [TQFP] (see Microchip Packaging Specification 00000049BS.pdf 44-Lead Plastic Quad Flat, No Lead Package - 9x9 mm Body [QFN] with corner pads; see figure 8.2 of https://www.silabs.com/documents/public/data-sheets/efm8bb1-datasheet.pdf 20-Lead Plastic Shrink Small Outline No-Lead 8-Lead Plastic Dual Flat No Lead Package - 3x3 mm Body [TQFP] With Exposed Pad Variation; (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot371-1_po.pdf STC SOP, 16 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/16L_UQFN_4x4x0_5mm_JQ_C04257A.pdf), generated with kicad-footprint-generator JST ZE series connector, S20B-PHDSS (http://www.jst-mfg.com/product/pdf/eng/ePHD.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py WSON, 8 Pin, TI DRG, (http://www.ti.com/lit/ds/symlink/lp2951.pdf#page=27), generated with kicad-footprint-generator Molex LY 20 series connector, S13B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole PLCC, 68 Pin (http://www.microsemi.com/index.php?option=com_docman&task=doc_download&gid=131095), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 16 Pin (https://www.allegromicro.com/~/media/Files/Datasheets/A4403-Datasheet.ashx), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-148-02-xxx-DV-BE-LC, 48 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Hirose series connector, B7PS-VH (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, old mpn/engineering number: 5569-16A1, example for new part number.

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