Buzz in Sound

**djXternal** · 10-13-2004, 01:08 PM

Hey Guys Just Recently Got My CarpC Installed...

Well now whenever i dont have ne music playing, but my speakers are turned on, i get a humming noise that increases in pitch according to engine rev... kinda entertainging sumtimes, but overall annoying

i was wonder what would be the best way to stop this interference? i have the line out cable going from my pc to another cable up front where it is then converted to rca plugs, which then goes to the AUX in on my HU

is it a problem with shielding or what?

**nirvanades** · 10-13-2004, 02:41 PM

Check out the grounding. You can also get a ground loop isolator - it is an interrupt that plugs in between your carputer and AUX unit. It will filter out most of what you are hearing.

**hijinks21** · 10-13-2004, 02:44 PM

ya check your grounding.. ground your computer case and PSU to your car frame.. if you use an inverter ground that to the same spot

**djXternal** · 10-13-2004, 02:55 PM

ok right now, my screen is plugged into the cigarette lighter...
the HU is grounded to a metal post behind itself in the center console...
the inverter is running straight to the neg terminal on the battery...
and what is the best way to ground my PSU and PC??

I have the original PSU that came with my PC, and my PC components are mounted on a wooden board and housed in a fiberglass enclosure.

**wyckyd** · 10-13-2004, 03:10 PM

Ground EVERYTHING to the same spot...this will eliminate your ground loop (comes from having 2 or more grounding points). I had the same thing going in my blazer even though I had everything except HU going to a ground on the body in the cargo area; however, once I grounded everything to the battery I had no probs.

**falconey** · 10-13-2004, 03:18 PM

Originally Posted by wyckyd

Ground EVERYTHING to the same spot...this will eliminate your ground loop (comes from having 2 or more grounding points). I had the same thing going in my blazer even though I had everything except HU going to a ground on the body in the cargo area; however, once I grounded everything to the battery I had no probs.

This proves a point I've tried to make time after time. You only should ground major components together. You shouldn't ground two components together that have huge variations in current draw unless of course you ground to the battery. I say don't ground to the battery and just find a better spot to ground. Grouding to the battery increases the amount distance the current must flow although wyckyd seems to have done it with positive results.

**hijinks21** · 10-13-2004, 03:52 PM

don't ground your inverter back to your battery. ground it to the car frame.. then ground the screw that holds in your computer PSU to the same spot.. that alone should kill all if not most of the noise.. your ground should never run back to your battery.. generally they should stay under a foot long

**nirvanades** · 10-13-2004, 03:55 PM

I agree with hijinks - ground your inverter close to itself... Find a bolt, something that you can use... Short grounds are important.

**hijinks21** · 10-13-2004, 03:59 PM

opps forgot to mention your other question.. you can get like a oring connector at radio shack.. attach some wire to it.. and the oring part just goes around the screw.. tighten the screw and do the same for the other end on the same screw you ground your inverter to

**teamwork1999** · 10-13-2004, 09:31 PM

I have a similar problem..the only thins is that my audio is not hard wired because i don't know how to do it...i am searching the net right now to learn how to do it...but i haven't been succesful...right now i am using an fm modulator to get sound from my computer to my car speaker and i have a similar problem, i hear the buzzing of the engine on my speaker plus the interference that comes by using the fm modulator...i will try to ground my unit tomorrow (if you guys check out my car pc you'll see that it's a pain in the *** http://home.earthlink.net/~teamwork1...ge/good%20pic/) to see if that helps with the buzzing...also does anybody know a good guide on how to hard wire the audio to the car speaker..i have a 2003 land rover freelander
thanx