M8 user external power supply has noise

What is power supply noise?

1. In the most general sense, power-supply noise is the combination of unwanted periodic ripple and spikes combined with random noise from the devices or external sources. The amount of input-referred ripple will be governed by the line regulation of your design.

How to reduce power supply noise?

Filtering, bypass, and post-regulation are the three primary ways to reduce power-supply noise, but there are some less-used techniques. One is to use a battery to power your circuitry. Batteries are a very low noise power source compared to switching or even linear converters. Another trick is available if you only need infrequent measurements.

Why is my power supply making a noise?

Power supply noise can potentially lead to performance issues, especially if the noise is caused by a faulty fan. An overheating power supply may result in reduced efficiency, random shutdowns, or even system instability. In some cases, power supply noise can indicate underlying issues that may cause damage to other components.

Why is noise at the power supply level important?

Another reason why it is critical to address noise at the power supply level is that virtually every device incorporates a power supply. Therefore, regardless of your design, it will most likely utilize a power supply and is, thus, susceptible to noise issues.