ON Semiconductor FAIRCHILD - QVE00832 - Phototransistor Infrared Emitter/ Sensor, Optical Slot Interrupter Switch.
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Siliconix / Vishay TEPT5700 AMBIENT LIGHT SENSOR PHOTOTRANSISTOR CHIP SILICON 570NM 2-PIN T-1 3/4 (10 pieces): Amazon.com: Industrial & Scientific
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