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PCB layout: front, back How to use for the Adafruit Feather M0 Wifi board, https://learn.adafruit.com/introducing-the-adafruit-wiced-feather-wifi Adafruit Feather series of reflective photo interrupter SMD PhotoDiode, plastic DIL, 4.3x4.65mm², RM5.08 PhotoDiode plastic DIL RM5.08 PhotoTransistor, sidelooker package, RM2.54 PhotoTransistor sidelooker package RM2.54 package for Everlight ITR8307 with PCB locator, 12 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 Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-131-02-xxx-DV-BE-A, 31 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 JST VH PBT series connector, B8P-VH (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, old mpn/engineering number: 1-770974-x, 8 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0694-9-81&productname=DF12C(3.0)-50DS-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000994748), generated with kicad-footprint-generator ipc_gullwing_generator.py Diodes Incorporated PowerDI3333-8 UXC, 3.05x3.05x0.8mm Body, https://www.diodes.com/assets/Package-Files/PowerDI3333-8%20(Type%20UXC).pdf Infineon, PG-TDSON-8, 6.15x5.15x1mm, https://www.infineon.com/dgdl/Infineon-BSC520N15NS3_-DS-v02_02-en.pdf?fileId=db3a30432239cccd0122eee57d9b21a4 X1SON 2 pin Molex connector | | | | | | R109, R111, R113 | 3 | A1M | Potentiometer | | | | | | | Tayda | A-1955 | | | | | R8, R10, R12 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | | | | | C2, C5, C6, C8, C9, C11, C12. C10, C14 too small for film; is film needed? - Smaller cap (476nF?) for C1 - Ceramic 104s for C10, C14, might be fine, might introduce intermittents - Don't put R8 so.

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