Today I found a wierd thing that as I removed the pin of the echo dot enter image description here

And after this I removed the adapter from the power supply and found a wierd buzz sound coming from the adapter but as I connected this pin to Echo dot thinking that it would stop the sound and to my surprise The buzz sound faded with time and eventually died down.

So I know that the charged capacitor inside it is loosing its energy. But what is the mechanism after which it is creating this weird buzz sound?

PS- I have original adapter and the voltage supply in my area is also constant.

Please try to explain it simply I am a high school student

  • $\begingroup$ If I've understood your question right, it seems much more likely that it comes from the transformer in the adapter, as opposed to the capacitors. This is usually because the adapter's a cheap knockoff, or your AC power supply in your area's iffy. I find it's often a combination of both :) $\endgroup$
    – Philip
    Nov 24, 2020 at 17:49
  • $\begingroup$ @Philip This is the genuine adapter provided by the amazon and the area where I am living also has a constant voltage and doesn't vary that much. $\endgroup$
    – Anonymous
    Nov 24, 2020 at 18:13
  • $\begingroup$ I actually want the mechanism and precisely the element which is creating this sound $\endgroup$
    – Anonymous
    Nov 24, 2020 at 18:14

1 Answer 1


Philip is correct, as the charger is poorly grounded, what you are hearing is the main's hum produced by a ground loop.


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