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Lit pushbuttons in 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 Bluetooth ble zigbee 802.15.4 thread nordic raytac nrf52840 nrf52833 Bluetooth Low Energy Module ble module st bluetooth Taiyo Yuden NRF51822 Module Bluetooth RF transceiver SMD style RF transceiver SMD style RF transceiver SMD style https://www.rfsolutions.co.uk/downloads/1456219226DS-ZETA.pdf RF transceiver SMD style https://www.rfsolutions.co.uk/downloads/1456219226DS-ZETA.pdf RF transceiver SMD style RF transceiver SMD style https://www.rfsolutions.co.uk/downloads/1456219226DS-ZETA.pdf RF transceiver SMD style RF transceiver THT style https://www.rfsolutions.co.uk/downloads/1456219226DS-ZETA.pdf Laird Technologies BMI-S-107 Shielding Cabinet Two Piece SMD 16.50x16.50mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-201-F Shielding Cabinet One Piece SMD 29.36x18.50mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-208-F Shielding Cabinet Two Piece SMD 36.83x33.68mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-203-F Shielding Cabinet One Piece SMD 13.66x12.70mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-103 Shielding Cabinet One Piece SMD 25.40x25.40mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-106 Shielding Cabinet One Piece SMD 32.00x32.00mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies 97-2003 EZ PEEL Shielding Cabinet One Piece SMD 26.21x26.21mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-102 Shielding Cabinet Two Piece SMD 26.21x26.21mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-106 Shielding Cabinet Two Piece SMD 26.21x26.21mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-201-F Shielding Cabinet Two Piece SMD 29.36x18.50mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-205-F Shielding Cabinet Two Piece SMD 32.00x32.00mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-203-F Shielding Cabinet One Piece SMD 44.37x44.37mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-210-F Shielding Cabinet THT 26x26mm WE-SHC Shielding Cabinet Two Piece SMD 38.10x25.40mm (https://assets.lairdtech.com/home/brandworld/files/Board%20Level%20Shields%20Catalog%20Download.pdf Laird Technologies BMI-S-101 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 SPDT form c vertical Omron Relay, SPST, https://gfinder.findernet.com/assets/Series/355/S32EN.pdf Finder 32.21-x300 Relay SPST Relay SPST-NO Omron Serie G6EK Panasonic Relay DPDT, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Omron Relay, DPDT, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Omron Relay DPDT, http://www3.panasonic.biz/ac/e_download/control/relay/power/catalog/mech_eng_jw.pdf?via=ok Relay SPST Schrack-RP-II/1 RM5mm 16A 250V AC Relay Relay SPST Schrack-RT2 RM5mm 16A 250V AC Form A http://www.alliedelec.com/m/d/543c6bed18bf23a83ae5238947033ee0.pdf Relay SPST Schrack-RP-II/1 RM5mm 8A 250V AC Form A http://www.sanyourelay.ca/public/products/pdf/SRD.pdf relay Sanyu SRD form A relay Sanyou SRD series Form A http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=RT2_reflow&DocType=DS&DocLang=EN Relay DPST Schrack-RT2 RM5mm 16A 250V AC Form A http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=RT2_reflow&DocType=DS&DocLang=EN Relay DPST Schrack-RT2.

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