Hi,
i have a Qwiic MP3 Trigger and it has some backround noise wehen it is not playing a sound file.
The electrecity source is a bench top powersupply with 12V and a adjustable stepdown power regulator to 3.3V.
At the other side is a 20W class D amplifier connected vie 3,5mm audio jack.
I tried the following things:
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played musik from a nother source to the amplifier / no noise
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taped off the earth connection on the power supply / no result
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changed from the amplifier board to a battery powerd bluethoothspeaker via 3,5mm audio jack / no result
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changed the 3,5mm audio jack to a soldert connection between the boards / no result
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changed the power source to a 12V Battery / no result
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powerd the MP3 trigger direcly with 3,3V from the benchtop powersupply and the amplifier with a 12V Battery / no result
Can somebody help me with my Problem?