How Does a Light-Detecting Book Light Circuit Work?

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The discussion focuses on the functioning of a light-detecting book light circuit, with a specific inquiry about the role of the emitter in the transmitter, which is marked with an "E." The circuit is confirmed to be operational, and a circuit diagram is provided for reference. Participants express a need for clarification on how the current flows through the emitter. Overall, the conversation aims to enhance understanding of the circuit's mechanics. The circuit's design and its components are central to the discussion.
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Firstly, the book light works fine. I'm also attaching a circuit diagram.


I don't really understand why the emitter of the transmitter (its marked with an E) takes in the current. Could someone explain to me how this circuit works?
 
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Poincare1 said:
Firstly, the book light works fine. I'm also attaching a circuit diagram.


I don't really understand why the emitter of the transmitter (its marked with an E) takes in the current. Could someone explain to me how this circuit works?

There's a circuit diagram? :wink:
 

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