I just soldered a brand new PoE module onto my Yun. (bought on arduino.cc). When i connect my Yun onto my PoE+ switch a strange sound is generated from the PoE module. The Yun is getting power over the ethernet cable. But that noise can't be normal?
I've made a short video that captured the sound: https://www.youtube.com/watch?v=crGa9u51yBo
It's annoying... Why is it doing that? An other PoE injector did not solve this. So it must be something with the PoE module.
All pins are soldered correctly. And the ethernet shield is not touching any pins on the PoE board.
My other Arduino board (EtherDue) with PoE does not make this noise...
Can i do something to resolve / reduce this sound issue?