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![]() The inductor and resistor are placed in series and replace R14. The filter consists of an inductor two ceramic capacitors, a resistor of 22 Ohm and two capacitors of 4700 uF/10V (Conrad art.number 422027). So adding a passive filter before the voltage regulator assures that the noise from the Raspberry doesn't reach the DAC.Īdding this filter improved the audio quality a lot! I cannot tell the difference with the high-end DAC anymore!įirst you have to remove R14 (0 Ohm) SMD resistor. I think the reason for this is the noisy power supply of the Raspberry Pi.Īlthough the board has a buit-in voltage regulator, this does not work well for high frequency noise that comes from the power supply. Unfortunately, the difference was rather big: the stereo image was not very detailed and it sounded a bit dull. External USB CD/DVD player with own power supplyĪfter the modification (see below), it sounds fabulous!Īt first, I compared the HifiBerry DAC+ Pro against my other media player with a high-end DAC ("B-DAC", 1200 euro).To improve the audio quality dramatically: add some filtering in the power supply (resistor + capacitor) see pictures below. ![]()
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