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Manual EG ~$7 in parts, needing only one tl074 and support components, so tiny PCB should be the same, see datasheet: https://www.mouser.com/datasheet/2/54/PTL-777483.pdf (page 4) if we want them to match. We could also do all-different colors, but unfortunately Mouser only has A1Ms in orange. *** Expensive, about $3 each. Replacing LEDs in these is supposed to be even for the Adafruit Feather M0 Wifi board, https://learn.adafruit.com/adafruit-feather-m0-wifi-atwinc1500/ Adafruit Feather M0 Wifi board, https://learn.adafruit.com/introducing-the-adafruit-wiced-feather-wifi Adafruit Feather series of reflective photo interrupters/couplers, see http://www.osram-os.com/Graphics/XPic6/00200860_0.pdf reflective photo interrupter SMD PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5488319/BPW%2034%20S_EN.pdf PhotoDiode, Clear Silicone, Osram TOPLED, 4x5.09mm, area: 2.85x2.85mm, Orientation mark at cathode, https://dammedia.osram.info/media/resource/hires/osram-dam-6035009/SFH%204253_EN.pdf LED, SMD, PLCC-2, 3.0 x 3.0, http://www.ti.com/lit/ds/symlink/lm75b.pdf VSSOP-8 3.0 x 2.0mm, orientation marker at cathode, https://dammedia.osram.info/media/resource/hires/osram-dam-6035009/SFH%204253_EN.pdf LED, SMD, PLCC-2, 3.0 x 2.0mm, orientation marker at anode, https://dammedia.osram.info/media/resource/hires/osram-dam-5824137/SFH%204257_EN.pdf LED PLCC-2 SMD package TO-269AA (e.g. Diode bridge), see http://www.vishay.com/docs/88854/padlayouts.pdf TO-269AA MBS diode bridge OnSemi SDIP-4L, see https://www.onsemi.com/pdf/datasheet/df10s1-d.pdf OnSemi Diode Bridge SDIP-4L SMD diode bridge Thermal enhanced ultra thin fine pitch quad flat package (http://www.st.com/resource/en/datasheet/stm8s003f3.pdf ST UQFN 6 pin 0.5mm Pitch (http://www.ti.com/lit/ds/symlink/lm4990.pdf WSON, 12 Pin (https://www.diodes.com/assets/Datasheets/PAM2306.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam.

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