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On the surface, when the light intensity changes, the oscillation frequency of the amplifier output also changes. The blind person can perceive the corresponding change of the external light intensity by the change of the acoustic frequency through the earphone. C: 0.47 UF, E: 3V.
This type of visual aid can be made very small, typically up to 1 inch by 3/8 inch. The volume is not large, but it can be heard with headphones.
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