摘要：四，低噪声，运算放大器和LDO用于建立与RIAA的均衡立体声前置允许电唱机（留声机）的信号转换成线性输出一个数字化的电脑声卡等Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSAUTOMOTIVEKeywords:lownoise,opamp,phono,phonograph,RIAA,preamp,opamp,operationalamplifiers,opamps,Mar14,2003amplifierAPPLICATIONNOTE1931USB-PoweredHighPrecisionHi-FiPhonoPreampAbstract:Aquad,low-noise,opampandLDOareusedtobuildastereopreampwithRIAAequalizationtoallowconvertingsignalsfromarecordplayer(phonograph)toalinearoutputfordigitizingbycomputersoundcardsetc.Aphonopreampisneededforpreamplifyingandequalizingtheanalogoutputofthegoodoldrecordplayer.Theformerhi-fiamplifiersorstereosincludedaphonoinput,butatthistimeitisnotverycommonbecausetheCDplayerhasalinearoutputanddoesn'tneedlinearization.Ifyoustillwantt
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