公司通常购买的所有雇员的一种类型的电话。但是，这意味着每个林格有相同声音，并且当一个电话响了，十几人暂停，看看他们的电话。同样令人讨厌的是没有的视觉消息指示器，所以任何人如怀疑他们可能有一条消息，必须举起手机，听听特别消息音。Maxim>AppNotes>AudioCircuitsKeywords:ChipRecorderCustomizesPhoneRingerSep06,2002APPLICATIONNOTE1187ChipRecorderCustomizesPhoneRingerCompaniesusuallypurchaseonetypeoftelephoneforallemployees.Butthismeansthateveryringerhasthesamesoundandwhenonephonerings,adozenpeoplepauseandlookattheirtelephones.Equallyannoyingistheabsenceofavisualmessageindicator,soanyonewhosuspectstheymayhaveamessagemustliftthehandsetandlistenforaspecialmessagetone.Byplacingacircuitinserieswiththetelephone(Figure1),youcancustomizeaphoneringerwithoutmodifyingthephone.Theheartoftheringerisachip-recorderIC(U5)capableofplayingupto10secondsoftelep
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