More details on my buzzing noise....
So I spent a couple hours yesterday troubleshooting this buzzing noise. It's a noise which is present in my carputer setup, EVEN WHEN MY CARPUTER ISN'T EVEN ON. It just has to be plugged in and receiving power (completing the circuit from the noise source (I'm guessing something in my car? ignition?) to the amp to the speakers (and you can hear it)).
This is what I've found:
* It's a buzzing sound, very faint, but gets louder as I increase my amp gains (so it's pre-amp noise)
* It goes away when I put on my LPF on my amp, so it's above 250Hz somewhere
* It doesn't seem audible when I turn my ignition to ACC, until I press the door lock (lock or unlock) button, then I can hear it, so it seems somehow tied to the doors and their electrical layout
I'm still not 100% certain it is not the PSU. I've heard PSUs can produce a slight buzzing.
Still left to do:
1. I need to pull the PSU and/or motherboard from the case and hook them up to the system w/out the case and see if it still occurs -- if it's the PSU, it could be that it was making noise into the PC case which then made it's way into the motherboard or something like that.
2. I need to try powering the PC from another car/battery, and see if it still does the same thing (then I'll know if it's my car or if it's my PC).
3. Any other ideas??
I could really use an oscilliscope to help find what freq. this buzzing is at or ranging around..
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