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photodiode
(redirected from Photo transistor)

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photodiode [ˌfəʊtəʊˈdaɪəʊd]
n
(Electronics) a semiconductor diode, the conductivity of which is controlled by incident illumination
photodiode  (ft-dd)
A diode that exhibits sensitivity to light, either by varying its electrical resistance like a photoresistor, or generating a electric potential in the manner of a photoelectric cell. See more at photoelectric.
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