R7800: faint hissing sound from power adaptor

[microchip8]

Hi,

bought the R7800 some days ago and set it completely up. Yesterday, I noticed that the power adaptor is making a faint hissing high-pitched noise. The router is stable, though, and everything works OK. I contacted support but it's weekend so will have to wait until I get a reply

Any other people with that issue and should I be concerned?

Thanks

[microchip8 · Accepted solution]

I found the issue. Power adaptor of the R7800 is fine, it was the adaptor of my switch which is plugged in in socket next to the adaptor of the R7800.

[microchip8 · Accepted solution]

I found the issue. Power adaptor of the R7800 is fine, it was the adaptor of my switch which is plugged in in socket next to the adaptor of the R7800.