I just bought a robot-lawnmower (Husqvarna Automower 105), which is working perfectly.

But the charging station is making a loud 50 Hz noise all the time, even without the robot charging. I have uploaded a video with the noise here: https://streamable.com/dd35mh

Any suggestions on what I could do to fix this? Would adding a ferrite bead have any effect? Would appreciate any tips on what could help. I haaaate trafo-noise. :p

  • \$\begingroup\$ If you think it's transformer noise how do you think a ferrite bead will solve it? \$\endgroup\$ – Transistor May 18 at 21:57
  • \$\begingroup\$ It was just a suggestion on a forum. \$\endgroup\$ – Naxda May 18 at 22:01
  • \$\begingroup\$ Some mains transformers are noisy, and some can be made noisy. Check which yours is before you spend money replacing anything. Can you disconnect the transformer from the equioment and run it on the bench? If it's still noisy there, replacing the transformer would help. If it goes quiet, it may be a faulty design of filtering component or load that allows a small DC current to exist, that would make any transformer noisy (I designed one of those loads inadvertently once!) \$\endgroup\$ – Neil_UK May 19 at 3:47

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