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    It’s quite common for a power supply (PSU) designer to work with a circuit designer to realize a system design compliant with international EMC

    regulations. PSU designers will be well aware of the requirement of the power supply to provide clean DC voltage and not disturb the AC mains voltage.

    However, they may not have any idea of the noise that can potentially be introduced to the mains through the PSU by the target circuit. Likewise, the

    circuit designers (digital or analogue) may not know what attenuation the PSU will provide.

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