Hola people.. Been a while since I was last here.
I just got my epia 800 mobo back after 6 months. I sent it for repairs when I found out that no sound was coming out, I think I must've fried the built in sound card.
I setup my carPC thru an inverter and a small 140W psu. I tested everything on my table desktop and it was all working fine. Then I put the setup into my car, and it boots fine. Just when I connect a stereo cable from the built-in sound card of the EPIA to the aux-in of the car radio, I hear the epia shut off.
To my dismay, I realized that the sound card was burnt again.
I put a lower fuse in the inverter and bought a cheap sound card to plug it into the PCI slot. However this pci sound cards have a higher tolerance than the built-in sound card on the epia. When I connect again the stereo cable from the audio-out of my sound card to the radio, it shuts off.. but this time only the fuse gets burnt.
I went to get a ground loop isolator.. it looks like a closed cylinder but I think it has transformers inside. I made a couple of stereo-to-RCA male and female connectors because the input/output of the isolator are RCA type connectors. So when I connect the setup to the radio using the ground loop isolator, the fuse no longer blows and I can listen to the sound fine. I think this works because no longer is the current flowing from the battery->inverter->PSU->epia->sound card->radio->battery because the transformers have no DC connection, I mean electrically the transformers dont touch each other. The stereo cable must've completed a loop back to the battery that is of the lowest resistance, hence burning the fuses due to the high current.
So you n00bies out there.. watch out before you plug in your sound card directly to the radio if you're using EPIA! I learned the hard way and I think I may have to go repair the mobo again.
Now I have a different problem..
1/ I can hear some static noise coming out of the radio and the radio screen is picking up some sound that I can see due to the animations.. it seems like some high frequency noises. I dont know how to fix this. I already have a ground loop isolator. Could it be because I made the stereo-RCA cable myself and I did a poor job at it? If I were to buy a ready-made stereo-RCA connector, should I replace the one connecting the sound card to the ground loop isolator or the one connecting the ground loop isolator to the radio?
2/ To hear songs on the speakers, I cant plug in the stereo plug perfectly inside, because then I'd hear sound coming from only 1 speaker where as the other is distorted. To hear the sound perfectly, I have to slightly pull the stereo connector out so that it doesnt completely go in but still connects into the aux-in of the radio. This sucks because when I hit a bump in the road, the connector comes lose and I lose audio and I have to carefully place the connector back in slightly again.
The stereo connector looks somewhat like this:
(incoming cable)===|==|=- (stereo tip)
I have the two grounds from the RCA (outer ring) connecting to the stereo tip and the one from the white RCA core to the middle and the one from the red RCA core to the other end of the stereo plug. I say white and red RCA core to mean the connector is white and the other is red.. there are two incomings to the RCA connector.. one to the outer ring which I assume is ground and in the middle there is a male center that looks like a shaft which I assume to be the core..
I have no idea what to call these components so I hope you guys understand what I mean. I'm new at these sound things so I hope you can shine some light on what I'm doing. I just connected stuff which I thought to make sense.
Thanks in advance.