Debugging item: amplifier IC

Countermeasure analysis and solution description

1. Link a 601T ferrite bead to each of the four pins, shown in the picture, of amplifier IC:

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2. Add 150PF capacitors between all the signal drop-out lines and earth:

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3. Add a 601T ferrite bead to each of the both pins of the 8MHz crystal oscillator:

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4. Clip ferrite cores to the wires shown in the picture:

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5. Add a clip-on ferrite core to power's DC end, and wind a turn:

Testing data