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
MrWizard wrote:
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
Easy to check - just turn off the converter and run off the battery, if the noise disappears then the converter is likely the culprit.
