Members luna5 Posted November 3, 2021 Members Share Posted November 3, 2021 I connected an amplifier board (TPA3116D2) and an mp3 decoder to the same 12vcc source and there is a noise in the loudspeaker. If the decoder and the amplifier board are connected to separate sources, the noise will disappear. Do you kndeow what you could do to connect them both to the same source without having the noise? Thank you. Quote Link to comment Share on other sites More sharing options...
Moderators daddymack Posted November 4, 2021 Moderators Share Posted November 4, 2021 sounds like you have a either a grounding issue or you have a polarity issue. Is either device grounded? Meaning a 3 prong plug? Quote Link to comment Share on other sites More sharing options...
Members Mr.Grumpy Posted November 4, 2021 Members Share Posted November 4, 2021 On 11/2/2021 at 9:11 PM, luna5 said: If the decoder and the amplifier board are connected to separate sources, the noise will disappear. Do you know what you could do to connect them both to the same source without having the noise? I'm definitely NOT an expert, but this sounds like a power supply issue. Have you installed de-coupling caps on the chips' power supply input? Refer to the "PVCC decoupling" on the schematic provided on the data sheet. Quote Link to comment Share on other sites More sharing options...
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