Texas Instruments TL972: There is no noise when using another company's amplifier in front of the headphone amplifier, but why does it produce noise when using the TL972?

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Texas Instruments TL972: Noise does not occur when using another company's amplifier in the front stage of the headphone amplifier. Why does the TL972 produce noise?

amplifier/linear

I'm assuming it's because your power wiring (even if you're using a battery) doesn't use a Faraday cage. Signal capture is most likely a nearby mobile phone.

Also, when verified by the manufacturer, we were able to reproduce a similar signal by putting the TL972 amplifier in the cage and placing the power supply outside the cage.

Since there is a difference in the internal configuration between the TL972 and the other company's amplifier, it is assumed that there is a difference in EMI rejection (PSRR) of the power supply.

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