I have an iPod Classic 6th Gen connected to my headunit via TV Out cable (cheap ebay cable), everything works well. video playback etc.
this cable has a USB connection that we can use to charge the iPod while its playing.
when i connect the USB to the USB car charger, i hear a whining noise, just like the noise you hear with a DC-DC converter. but this is not a ground loop or noise issue in the car cigarette lighter port, even with a Ground loop isolator connected, issue persist.
so i made a small 7805 and connected to the USB, it works like a charm, the iPod get charged and everything. so we can say for sure its the USB charger. but the issue with linear regulator are they get HOT.
my question is, can anyone recommend a good USB charger that will resolve this issue ?