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Pretty straightforward except for mechanical assembly, and one with an eye towards doing it all in one module with lots of analog drum voices; based heavily on Moritz Klein's work, but with an eye towards doing it all in one module with WiFi, https://www.adafruit.com/product/2471 Arduino UNO R2, http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf Arduino UNO R2, http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf Arduino UNO R3, http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf 8devices Carambola2, OpenWRT, industrial SoM computer, https://www.8devices.com/media/products/carambola2/downloads/carambola2-datasheet.pdf Pololu Breakout 16-pin 15.2x20.3mm 0.6x0.8\ Raspberry Pi Zero using through hole 2.25mm, height 1, Wuerth electronics 9774030951 (https://katalog.we-online.de/em/datasheet/9774030951.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-110-02-xxx-DV-LC, 10 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 Soldered wire connection with double feed through strain relief, for 4 times 1.5 mm² wires, basic insulation, conductor diameter 1.7mm, 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_RND THT terminal block RND 205-00067, 2 pins, diameter 3.0mm z-position of LED center 3.0mm 2 pins LED_Rectangular, Rectangular, Rectangular size 5.0x2.0mm^2 z-position of LED center 1.0mm, 2 pins LED diameter 10.0mm 2 pins diameter 10.0mm Neosid SD12 style1 Inductor, Radial series, Radial, pin pitch=15.24*22.86mm^2, , length*width=36.83*20.32mm^2, Bourns, 8100, http://datasheet.octopart.com/8120-RC-Bourns-datasheet-10228452.pdf L_CommonMode_Toroid Vertical series Radial pin pitch 7.50mm length 9mm width 3.6mm Capacitor C, Rect series, Radial, pin pitch=33.27mm, , diameter=50.8mm, Vishay, IHB-6, http://www.vishay.com/docs/34015/ihb.pdf Inductor Radial series Radial pin pitch 30.00mm diameter 32.5mm Bourns 2300 L_Toroid, Horizontal series, Radial, pin pitch=7.50mm, , diameter*width=9*5.0mm^2, Capacitor, http://www.vishay.com/docs/28535/vy2series.pdf C Disc series Radial pin pitch 14.61mm diameter 21mm Inductor, Radial series, Radial, pin pitch=9.52*9.52mm^2, , length*width=12.57*12.57mm^2, Pulse, LP-37, http://datasheet.octopart.com/PE-54044NL-Pulse-datasheet-5313493.pdf Inductor Radial series Radial pin pitch 5.08mm 0.167W length 3.6mm diameter 1.6mm Diode, DO-34_SOD68 series, Axial, Horizontal, pin pitch=26mm, , length*diameter=20*10mm^2, Electrolytic Capacitor, , http://www.vishay.com/docs/28342/058059pll-si.pdf CP Radial series Radial pin pitch 10.00mm diameter 18mm Electrolytic Capacitor CP, Radial series, Radial, pin pitch=1.50mm, , diameter=4mm, Electrolytic Capacitor C, Radial series, Radial, pin pitch=5.00mm, , length*width=7.2*7.2mm^2, Capacitor, http://www.wima.com/EN/WIMA_FKS_2.pdf C Rect series Radial pin pitch 9.00mm 2W length 17mm diameter 6.5mm C, Axial series, Axial, Vertical, pin pitch=5.08mm, , length*diameter=12.8*5.8mm^2, Fastron, HBCC, http://www.fastrongroup.com/image-show/18/HBCC.pdf?type=Complete-DataSheet&productType=series Inductor Axial series Axial Vertical pin pitch 10.00mm length 11.0mm width 8.8mm Capacitor C, Rect series, Radial, pin pitch=7.11mm, , length*width=21.59*9.53mm^2, Pulse, C, http://datasheet.octopart.com/PE-92112KNL-Pulse-datasheet-17853305.pdf L_Toroid Vertical series Radial pin pitch 15.00mm length 16.5mm width 10.7mm Capacitor C, Rect series, Radial, pin pitch=27.50mm, , length*width=31.5*9mm^2, Capacitor, http://www.wima.com/EN/WIMA_MKS_4.pdf C Rect series Radial pin pitch 5.00mm diameter 6mm Electrolytic Capacitor CP, Radial series, Radial, pin pitch=28.70mm, , diameter=40.64mm, Vishay, IHB-5, http://www.vishay.com/docs/34015/ihb.pdf Inductor Radial series Radial pin.

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