Visible light communication receiving circuit diagram

A simple visible light communication receiving circuit diagram. This circuit provides a maximum output of 500mW to a 15Î© speaker when the photocell is illuminated by a light from a properly modulated infrared light transmitter (emitting distance of 137.2m). This system is suitable for use in the case where the wiring line is inconvenient, and is used under the condition of a wavelength of about 0.9 Î¼m. The main circuit is shown below.

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