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Four-way answering system

 
Overview

A four-channel real-time resettable answering machine system composed of two SN74LS00N and two SN74LS20N is used to record the first person to answer, and also record the person who has answered (who has not answered successfully but has pressed the answer button will also be recorded). #digital classroom design

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Update:2025-06-23 13:01:54

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