Circuit that restraines noise of plug audio equipment in -process

The utility model relates to an earphone equipment field, in particular to circuit that restraines noise of plug audio equipment in -process. Among the circuit that restraines noise of plug audio equipment in -process of this embodiment, voltage detection circuit sends the voltage variation signal for arriving logic control circuit according to the voltage state that audio connector inserted / extracted audio equipment, logic control circuit's control chip U1 has discerned audio connector and has inserted or extract, control the comparator output high level immediately, single -pole double -throw discerns comparator output's high level signal, disconnect at once, thereby cut off the audio signal that the speaker was given in output. Insert or extract audio equipment as audio connector, current -voltage is at the in -process that changes, through control chip U1 disconnect and the speaker between logic switch, cut off audio output, solved the problem that appears the sound of " puff " in the speaker that cause