USB adapters make a whining noise?????
This one is too many for me... I have a 12V socket in my RV for recharging phones and stuff. Any USB adapter I plug into it makes a whining sound, which someone once told me was a bad capacitor. They ...
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I agree with the "Turn off converter" suggestion.
Even with 15 volts in they should be silent. A Hissing sound is often the reslut of a failing connection somewhere.
Even with 15 volts in they should be silent. A Hissing sound is often the reslut of a failing connection somewhere.
