光电音量控制器

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1、·Home·ProductsoOptoelectronicsoSolderablePhotodiodesoPhotodiodesinHermeticPackagesoPhotodiodesonCeramicSubstrateoPhotodiodeArraysoCdS/CdSePhotocellsoTransmissive&ReflectiveAssembliesoAudiohmoOptocouplersoAudioCharacteristicsoPrinciplesofOperationoProduct

2、DatasheetsoDatasheetIndex·CapabilitiesoMicroengineeringCapabilitiesoConcept,DesignandPrototypeoValidationandTestingoManufacturingandDistributionoApplicationSamples·TechnicalReferenceoAudiohmApplicationNotesoCompressoroLimiteroSwitchoLevelControloExpander

3、/NoiseGateoAnimatedOptocouplerPresentation·AboutSilonexoCompanyProfileoCareers·Sales&SupportoMainSales&SupportoHeadOfficeoRepresentatives&ProductDistributorsoRegionalSalesRepresentativesoProductDistributors 16TechnicalReferenceAudiolevelcontrolwithresist

4、iveoptocouplers[  optocouplercomparisontable  ][  attenuator configurations  ][  definedattenuationlaw  ][  crossfader  ]Controllingthelevelofanaudiosignalbymeansofanappliedvoltageorcurrenthasalwaysbeenproblematicalbutoftendesirable,particularlywhenitisn

5、ecessarytocontrolacircuitfromacomputer.Thisapplicationnotedealswithvoltageorcurrentcontrolledattenuatorsusingoptocouplers,primarilyinrelativelystaticsituations(asopposedtothedynamiccontrolthatoccursincompressors,limitersandnoisegateswherethegainiscontinu

6、ouslybeingchangedinrelationtothesignal).Althoughthecircuitconfigurationsarebroadlysimilartothoseusedwhenswitchingaudiosignals,thedemandsontheoptocouplerareratherdifferent,asitisbeingusedasavariableresistorratherthanbeinghardONorOFF.Audiohmoptocouplersoff

7、erauniquesetoffeaturesforcontrollingaudiosignallevels.Themainfeaturesare:1.Veryhighisolationbetweencontrolportandaudiocircuit.2.Relativelysimpledrivecircuit.3.Relativelylowdriverequirement(<60mW)4.Verylowcontrolfeedthrough.5.Medium->gooddistortionperform

8、ance.6.Largesignalvoltagerange:upto500V.Tocomparetheirperformancewithothermethods:DeviceSignalvoltageIsolationvoltage/feedthroughDrivecomplexityPowerconsumption#DistortionSpeedCostJunctionFETafewV0/mediumhigh2-50mWmedium*f