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Vishay Ambient Light Sensor Development Kit, Vishay Semiconductors. $85. www.vishay.com/photo-detectors/

You will find ambient-light sensors in keyboards, LCDs, dashboards, kiosks and other devices that automatically adjust their illumination to ambient-light conditions. The five sensors in Vishay's product lineup--TEMT6000, TEMT6200F, TEPT4400, TEPT5700 and TEPT5600--produce outputs in proportion to light intensity. (The company offers many other light detectors, too.) Spectral characteristics vary and the P-type packages provide through-hole leads and the M-type packa

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