I have built a Bluetooth Stereo System but i'm getting really bad static noise in it. I'm using a 5V USB DC step-down converter from a 12V 4 Amp DC PSU(the model is YU1208). When i use the Bluetooth receiver it puts out lots of noise (literally through the speakers) but when it hooked up to a 12V battery instead of the YU1208, the Bluetooth receiver works perfectly. i tried a choke and a 680μF capacitor in series with the USB module but it still is getting the noise. What is the cause of this noise and Is their any easy solutions to fix it or will i have to find a new 12V power supply?
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