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A LED or a phototransistor?!

IR LED and a photo-transistor - which is which? (click for high-res)

Among the electronic components I’ve ordered recently were a Kingbright L-53F3BT infrared LED and a Kingbright L-53P3BT infrared photo-transistor (PT). All was fine, until the salesman at the local shop told me:

We’re having a little trouble with our inventory – these components are from the two different storage bins, but they seem to be identical. Probably someone has misplaced them, when restocking. Can’t tell you which is which. We can get you the right ones tomorrow, if you’d like to wait…

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