Visible light receiver
The amplitude-modulated optical signal receiver uses a phototransistor Q1 installed in a parabolic mirror (in order to expand the range). Any NPN phototransistor can be used. The output of the follower Q2 driver amplifier Q3.Q3 is sent to the volume control resistor R7 and the audio amplifier U1, and the 9-12V power supply is applied to the receiver.
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