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Infrared detectors

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Fredinappolis | 23:54 Mon 05th Apr 2010 | How it Works
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I made an infrared detector circuit with the little infrared detector and emitter from radioshack. My problem is that I don't understand how the detector works. Can it detect any infrared radiation, or is it just for the emitter that comes with it? I just need to understand the theory behind it. Does anyone have any good websites that describe how this works? Thanks.
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as in something similar to a PIR on a burgler alarm?

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Infrared detectors

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