The circuit given here generates
music in tune with the light. One IC 555 is used as an astable multivibrator
although, we can also use two transistor in place of this IC as shown in
figure. In both the circuits one LDR is used. As light falls on LDR of both
circuits, current begins to flow. The of this current depends upon the
intensity of light falling on the LDR. IC 555 produces audio frequency
according to the flow of current and we can hear panoramic music.
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