jana104 Posted August 3, 2011 Report Share Posted August 3, 2011 Hi all ;DI have purchased a USB MP3 KIT from my local store.Where I can Play MP3 songs from my date stick or my data card.I am using LA4440 Audio Amplifier for listening audio. Its Sound quality is Excellent. But a background humming and data reading noise from USB is wasting the sound quality. can any one help me?thanks in advance... :( Quote Link to comment Share on other sites More sharing options...
blood.electronix Posted August 18, 2011 Report Share Posted August 18, 2011 It appears audio wire coming out from USB board to power amplifier IC LA4440 or pre-amplifier is not shielded properly. 8) Quote Link to comment Share on other sites More sharing options...
vinaykumar Posted September 20, 2011 Report Share Posted September 20, 2011 once check total grounding and sheilding fromm preamp...........then it may rectify if not change the ic once... Quote Link to comment Share on other sites More sharing options...
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