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PDB / LC Filter / Volteage Regulator Making humming noise
#1
I've got a eachine PDB and it makes a weird hum noise (sound) when I plug my FPV gear on it, if I unplug the nosie disappear.

Same happened before with my Matek PDB from banggood, I thought it was that PDB, but now it's happening again on this eachine one too.

where is the noise coming from? LC filter? or voltage regulator?
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#2
I think those kinds of switching regulators produce coil hum noise, that's fairly normal.
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