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Project title Demonstrate how the light from a Light Emitting Diode can be modulated by using sound
Difficulty Level High school
Main link Click here to view all details of this science project (Cached)  (View 3rd party site)

Description
This project can amplitude modulate the light being emitted from an LED using the 8 ohm earphone output from a small radio or amplifier. For demonstrating, it is very convenient to use a small radio to supply the audio signal.  

Materials
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Brief Instructions
[Please see third-party website for instructions]
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