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 ...
Forum Discussion
Two guess
Your house 12v is close to 15v or above
You have an A.C. Voltage ripple in your house 12vdc
Meaning your converter is failing
Test with multi-meter on the lowest ac voyage setting
Test at the 12v socket
Your house 12v is close to 15v or above
You have an A.C. Voltage ripple in your house 12vdc
Meaning your converter is failing
Test with multi-meter on the lowest ac voyage setting
Test at the 12v socket
