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A resistor, used in certain photoelectric cells, whose resistance varies as a function of the intensity of light it is exposed to. Also called photocell.
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Using a photoresistor and a piezo element, you're going to make a light-based theremin .
Sumitomo established an advanced materials section that dealt in electronic materials, and tried to strengthen the photoresistor business for semiconductors in 1991.
This variable beam was then caught by a photoresistor (Vactec VT 732E 77 29, EG & G Vactec, 200 Orchard Ridge Drive, Suit 100, Gaithersburg, MD 20 878, USA) mounted within a plastic black cylinder (25 mm long).