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Well I installed my rear aux setup fairly successfully. The whole time I was working on it I had the car off so I didn't notice the problem until late.
First of all let me break down the setup. I am mirroring my galaxy note 2 through the rear aux. I made my own aux cables, I have a 5 to 11 pin MHL specifically for the galaxy phones. I have my phone charger plugged into the MHL for power, I have a HDMI to RCA converter that I had to run power to as well. My 12v phone charger has 2 USB plugs on it so that wasn't a big deal as I just ran a 2nd USB cable from it to the converter to power it.
The setup works fine when the car is off and it works with the car on as well with the exception of the added alternator noise that increase with acceleration. I think the noise is being introduced at the HDMI to RCA converter though the USB power cable. If the car is running and I am hearing that slight whine/buzz it stops as soon as I unplug the power cable to the converter.
I have heard of the old school fixes to problems like this where they add some sort of filter to the power wire of an amplifier but I really don't know what to do with this setup.
Any ideas on how to fix it?
First of all let me break down the setup. I am mirroring my galaxy note 2 through the rear aux. I made my own aux cables, I have a 5 to 11 pin MHL specifically for the galaxy phones. I have my phone charger plugged into the MHL for power, I have a HDMI to RCA converter that I had to run power to as well. My 12v phone charger has 2 USB plugs on it so that wasn't a big deal as I just ran a 2nd USB cable from it to the converter to power it.
The setup works fine when the car is off and it works with the car on as well with the exception of the added alternator noise that increase with acceleration. I think the noise is being introduced at the HDMI to RCA converter though the USB power cable. If the car is running and I am hearing that slight whine/buzz it stops as soon as I unplug the power cable to the converter.
I have heard of the old school fixes to problems like this where they add some sort of filter to the power wire of an amplifier but I really don't know what to do with this setup.
Any ideas on how to fix it?