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Discussion Starter #1
Hey guys,
Im kinda not bad at electronics, but im not great. I have an aftermarket head unit setup in my insight. It has an AUX in which i hook up my ipod too. I accomplish this through a 12v adapter whcih has an audio out on it. But the problem is that i am getting white noise comming in. The noise is synced with RPM... in other words, its a ticking that picks up frequency with RPM...

I think that this is due to some kind of poor ground somewhere. But How do i fix the problem. The word isolator comes to mind, but i cant seem to remember why! Can i just re-ground the head unit/ 12v circuit to a better ground?

Any help would be appreciated!
 

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Discussion Starter #2
Ok. so i am gonna reply to meself. I found the isolator i was looking for.

It is a ground loop isolator. I am going to go get ome of these today. That should clean up the audio signal somwhat. However, I am still not satisfied. I would like to find the source of the this noise and eliminate it!

Now knowing what the problem is though, I will crack open the dash this weekend and see what i can find!

The rpm dependent ticking noise makes me think somehow im getting singnal noise from my ignition system. This idea scares me a little. The DC socket im using to power my audio adapter must be picking up the signal noise through the DC ground somehow... I guess i will have to re ground the outlet to some cleaner ground...

Still looking for help/suggestions though.
 

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Thats deffinitely some interference from the ignition somehow. So it does not do it when just using the radio itself, but only when you are using your ipod right? I would say try powering the ipod separately and see if it does it, if it does not then it's something with the incomming power to the ipod.
 

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Discussion Starter #4
actually... the interference is really quiet.. so it might do it with the radio but i probably would not hear it.. as i often drive with windows open and sound up. The only reason i heard it today was that as i was parking i paused the Ipod.
 
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