Although linear power supply designs are usually bulkier, they definitely produce a considerably smaller level of interference. Hence, if your gadget can get the job done competently without SMPS circuits, consider using a linear power supply to attenuate the result of EMI. The entire name of EMC is Electromagnetic Compatibility. https://youcanuseaudiencetargetin13456.blogdun.com/31818210/getting-my-emi-emc-filter-circuit-to-work