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The power supply is pulled down?

Hardware design
July 15, 2020 by Dante 327

I bought a voice module. During debugging, I found that the speaker has noise. When connecting the oscilloscope to watch the speaker, the 5V power supply has noise. Should it be a power supply problem? It is the power supplied by the DC power supply. May I ask how can I filter out such a situation where the voltage is pulled down?


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Drake Posted on July 15, 2020

Try to slightly modify the high-frequency filter capacitor of the power supply.

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Malik Posted on July 15, 2020

To strengthen the power supply filtering, especially the high-frequency capacitance value, the speaker will consume power, and the voltage provided by the power supply module cannot be pulled down. Normally, there should be no voltage drop.

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Ellis Posted on July 15, 2020

The current consumed by the speaker is quite large, sometimes much larger than the working current of the IC;

Adjust the voltage value properly to see if it is possible, that is, the PSSR value of the LDO is not enough, and changing the LDO will improve;

More enlarged electrolytic capacitors will also be improved;

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