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And ground needed, probably up to it. MSD: L* L* -> only second half of normal; muffle optional? A 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-5467146/SFH%202440_EN.pdf DFN, 6 Pin (https://www.ti.com/lit/ds/symlink/sn74auc1g04.pdf#page=24), Solder.

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