telephone on-hook reminder(II)

Published:2011/7/12 0:24:00 Author:chopper | Keyword: telephone, on-hook, reminder | From:SeekIC

This example describes telephone on-hook reminder,and it can send a sound di when the telephone is on-hook to tell the users that the telephone has been hung up. Principle of the circuit This telephone on-hook reminder circuit includes trigger circuit,inverter,delay circuit,audio oscillator and audio output circuit,just as picture 6-207 shows.



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