cole7011 Posted March 30, 2005 Report Share Posted March 30, 2005 Any chance someone can tell me the theory and method behind infrared transmission and reception, how it works etc... universal circuit requirements... basically the principal behind it, etc etc...many thanks mcole Quote Link to comment Share on other sites More sharing options...
Lou Posted March 31, 2005 Report Share Posted March 31, 2005 HiHere is a small primer on the subject to begin with:http://www.web-ee.com/primers/files/an1016.rev0.pdf Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted April 1, 2005 Report Share Posted April 1, 2005 Infrared is used in digital transmission. Since it is a transducer, it is not accurate enough in theory to transmit analogue signals. You might even choose to use something other than infrared. It all depends on the wavelength expected by the photodetector. Quote Link to comment Share on other sites More sharing options...
cole7011 Posted April 1, 2005 Author Report Share Posted April 1, 2005 thanks, but how does a Phototransistor work, what is the typical method of converting the output in to a useable signal for activation of say a relay, How is rectified ? etc? Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 1, 2005 Report Share Posted April 1, 2005 Kevin,Infrared is used for wireless headphones and speakers. Since the response of a phototransistor is not very linear with amplitude, usually FM modulation and detection is used. I have seen huge arrays of IR LEDs in conference rooms for language translation. They are beamed to IR detectors that drive headphones. Quote Link to comment Share on other sites More sharing options...
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