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Compare to online 8-note schematic, or extend MK's 5-note to 8-note. Expanding out to 8 notes means ~$16-20 in parts, depending on PCB with on-board antenna Bluetooth Dual-mode 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 Bluetooth external antenna espressif 20*15.4mm 2.4 GHz Wi-Fi and Bluetooth combo chip https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf Single 2.4 GHz Bluetooth ble zigbee 802.15.4 thread nordic raytac nrf52840 nrf52833 Bluetooth Low Energy Module ble module st bluetooth Taiyo Yuden BK Series (see https://www.yuden.co.jp/productdata/catalog/mlci09_e.pdf Inductor, Walsin, WLFM201209x, 2.0x1.25x0.9mm, http://www.passivecomponent.com/wp-content/uploads/inductor/WLFM_C_series.pdf Inductor, Walsin, WLFM201609x, 2.0x1.6x0.9mm, http://www.passivecomponent.com/wp-content/uploads/inductor/WLFM_C_series.pdf Inductor, Wuerth, WE-XHMI 8080, 8.3mmx8.8mm (Script generated with kicad-footprint-generator Soldered wire connection, for 4 times 2.5 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 2.3mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_310591_RT063xxHBWC_OFF-022684T.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix MKDS-1,5-16-5.08 pitch 5.08mm length 14.5mm diameter 5.8mm Fastron HBCC Inductor, Axial series, Axial, Horizontal, pin pitch=45mm, , length*diameter=42*32.0mm^2, Electrolytic Capacitor, , http://www.vishay.com/docs/42037/53d.pdf CP Axial series Axial Horizontal pin pitch 10.00mm length 11.0mm width 8.8mm Capacitor C, Rect series, Radial, pin pitch=5.00mm, , diameter=7.0mm, Tantal Electrolytic Capacitor CP, Axial series, Axial, Horizontal, pin pitch=52mm, , length*diameter=46*20mm^2, Electrolytic Capacitor CP, Radial series, Radial, pin pitch=10.00mm, , length*width=11.0*5.1mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 27.5mm length 22mm diameter 10.5mm Tantal Electrolytic Capacitor, , http://www.vishay.com/docs/42037/53d.pdf CP Axial series Axial Horizontal pin pitch 25mm length 19mm diameter 8.0mm Tantal Electrolytic Capacitor, , http://www.vishay.com/docs/42037/53d.pdf CP Axial series Axial Vertical pin pitch 7.62mm 15W length 47.6mm width 9.5mm height 9.5mm with RM7.6mm Generic Buzzer, D14mm height 7mm with pitch 10mm size 115x10.3mm^2 drill 1.3mm pad 2.5mm terminal block connector PhoenixContact PTSM0,5 8 HV 2,5mm vertical SMD spring clamp terminal block RND 205-00086 pitch 10mm size 55x8.1mm^2 drill 1.1mm pad 2.1mm terminal block RND 205-00295 pitch 5.08mm size 66x11.2mm^2 drill 1.3mm pad 2.5mm terminal block.

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