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比较器感应到数字线路的状态，而不画线的电源。Maxim>AppNotes>AmplifierandComparatorCircuitsKeywords:galvanicisolation,digitalstatedetection,single-turntransformerMar23,2005APPLICATIONNOTE3473ReadIsolatedDigitalStatesWithoutPowerDrainAbstract:Asimplecircuitemploysasmalltransformerandlatchedcomparatortosensethestateofadigitallinewithoutdrawingpowerfromtheline.AsimilarversionofthisarticleappearedintheNovember25,2004issueofEDNmagazine.Electronicsystemsmustoftenisolatetheirinputsoroutputsfromthemainreferencecommon(ground).Variousconditionscanmakenecessarysuchgalvanicisolation:thetypeofinputsensorordrivenactuator,safetyconsiderationsformedicalequipmentattached