OPTICAL_COMMUNICATION_SYSTEM

Published:2009/7/5 22:36:00 Author:May | From:SeekIC

The circuit will modulate the light from the LED usmg a crystal cnicrophone or a loudspeaker output．To obtain the maximum range，the optical system must be efficient（see example），Either a convex lens or a concave mirror can be used to convert the LED output into a parallel beam．The received light is concentrated onto a sensitivephotodarlington transistor. At short range the signal across the load resistor is adequateto drive a crystal earpiece，for longer range an amplifier and a loudspeaker are needed.



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