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Step 7Various light sources
Many artificial forms of light vary in intensity with frequencies in the audio region. Some examples include incandescent light bulbs, LED displays on microwave ovens and other kitchen appliances, computer monitors, TV-remotes, etc.
Provided you've put everything together correctly, you will hear some kind of sound coming out of the amplifier when the solar cell is receiving light from a time-varying source.
In case all you have are non-varying "DC" sources of light, like sunlight, try waving your hand back-and-forth in front of the solar cell, quickly blocking and unblocking the light reaching it. This should produce a soft clicking noise at each dark-to-light, light-to-dark, transition.
Provided you've put everything together correctly, you will hear some kind of sound coming out of the amplifier when the solar cell is receiving light from a time-varying source.
In case all you have are non-varying "DC" sources of light, like sunlight, try waving your hand back-and-forth in front of the solar cell, quickly blocking and unblocking the light reaching it. This should produce a soft clicking noise at each dark-to-light, light-to-dark, transition.
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