I finally got rid of my head unit and connected the carputer straight to a preamp but I've come to a problem I havent got to before. NOISE! I didnt have this much noise when I was hooking up to my head unit.
From what I've read of previous posts ( :search: )..
a) Grounding need to go to the same point (Please explain why, isnt ground supposed to be ... ground?)
b) Need to ground the carputer case. Hrmm, my case is made of glass.. how do you ground glass?
c) Unclear on this one, exactly what needs to be grounded to the same point.. Preamp? Amp? Inverter? PSU? glass carputer case? external HD?
d) Someone mentioned in another post that if I ground on multiple points on the car body, there will be an ohmic value if I attach a multimeter between those points. Meaning there will be current flow between those 2 ground points if my high school physics memory serves me correctly. I checked with my consumer-grade multimeter, everypart of the body gives an ohmic value of 0. So should I still ground on the same point?
e) Do I need a big wire for this or can I use the small ones like those used in making small PCBs in small electronic projects. If I do need a big wire, why? Isnt a wire just a wire?
f) What's the purpose of the ground loop isolator? I connected one and it still gives me the same amount of noise.
g) I read somewhere also that noise cannot be rid off completely. It can only be reduced. Could it be that I've done all that I can?
h) What is this filter circuit inside the PSU someone here mentioned? Even if I know how to open my PSU up, how do I know which one is the filter circuit, what should I be looking for? And how do I remove it? Keep in mind I have no idea what is the difference physically between a capacitor, resistor and transformer on a pcb.. they all look the same to me.
I think that's all for now. Heh, I should have paid more attention to electronics in high school.
Thanks in advance.