My car stereo has an AUX input on the front of it that I used to hook my
MP3 player to. Now, when I play the MP3 player straight from the battery,
I have no problems. However, when I plug the player into the power adapter
from the cigarette lighter, I get a hissy noise. I tested a ground loop
isolator between the player and the AUX input, and it took care of the
problem. I use the isolator on my PC though. Before I run out and spend
$15 on another isolator, is there a cheaper or easier alternative to
getting rid of this noise?