标签: ringer

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……

系统包括语音服务与数据服务。这种系统使用用户线接口卡（SLIC）功能，以保持与原有设备的兼容性。在这些系统所需要的电压，因国家而异，取决于特定的应用程序。本文讨论了如何在使用MAX668升压控制器等系统所需的各种电压。分裂的反馈意见，以改善交叉调节。还介绍了一个例子是一个孤立的电源。Maxim>AppNotes>AUTOMOTIVEPOWER-SUPPLYCIRCUITSKeywords:SLIC,ringervoltage,on-hook,off-hook,flyback,transformer,boost,snubber,isolatedpower,Jun01,2001customerpremiseequipment,subscriberlineinterface,splitfeedback,flybackpowersupplyAPPLICATIONNOTE904SLICPower-SupplyDesignAbstract:Integratedcommunicationsystemsincorporatevoiceservicewithdataservice.Suchsystemsusesubscriber-lineinterfacecard(SLIC)functionstomaintaincompatibilitywithlegacyequipment.Thevoltagesrequiredinthesesystemsvaryfromcountrytocountryanddependsontheparticularapplication.ThisarticlediscusseshowtoderivevariousvoltagesrequiredinsuchsystemsusingtheMAX668boostcontroller.Splitfeedbacktoimprovecross-regulationispresent……