Automatic Recording Telephone Interface Circuit

Published:2011/7/13 7:57:00 Author:Michel | Keyword: Telephone Interface Circuit | From:SeekIC

The automatic recording telephone interface circuit is shown as above.This circuit has the functions of automatic answer and recording.It needs install small tape recorder and solid recording chip.)The circuit is simple and it's needless to open the telephone when static current is less than 20μA.IC1 is a photoelectric coupler.IC2 is a decimal count/distributor and when the fourth ring ends,⑩ feet outputs high level,riggering behind circuit.IC3 is voice circuits which records The honest is absent,please leave a brief message. Primary B uses Φ0.1mm enameled wire to circle 350 turns,the secondary level adopts Φ0.07mm enameled wire to circle 1000 turns. s



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