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power supply - What is the purpose of the ferrite bead on DC Adaptors? - Electrical Engineering Stack Exchange
![Put a bunch of these ferrite beads on everything I plug into my truck and finally found electrical silence on 2m! : r/amateurradio Put a bunch of these ferrite beads on everything I plug into my truck and finally found electrical silence on 2m! : r/amateurradio](https://i.redd.it/ckdn3rtls5r51.jpg)