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  1. M

    audio production powered by DC-DC??

    DC-DC check working freq of DC-DC also. If is below 20000 Hz, you have to change it. Are you using 22uH coil ?? (rather bigger size for this current with ferrite core - not power iron ).
  2. M

    audio production powered by DC-DC??

    Use additional filter on output voltage (coil+capacitor). If you can, show schematic you use (only part of DC-DC). In application note, Maxim suggest inductor about 22uH and low ESR capacitor. And working freq is about 300kHz (you can't hear it 8O at normal operation)

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