carputer giving a hum noise with music
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=130008
Printed Date: April 25, 2024 at 7:56 PM
Topic: carputer giving a hum noise with music
Posted By: still_walkin
Subject: carputer giving a hum noise with music
Date Posted: January 03, 2012 at 2:39 AM
So here the deal I have a nettop pc and im relplacing my cars HU with the pc so ipulled the radio and plugged the rca's into the PC's line out I get sound but a loud Hummer. So I had a sound blaster sb 1060 and I got the same result.I plugged the pc to a TVs RCA input and got a clean signal. so I got my cell phone plugged it up to the same mini jack no problems so what can be wrong with the pc. So im thinking bad rcas
-------------
1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Replies:
Posted By: DYohn
Date Posted: January 03, 2012 at 9:24 AM
Ground problem. ------------- Support the12volt.com
Posted By: still_walkin
Date Posted: January 03, 2012 at 10:02 AM
Ok makes sense but I used the dames connections and plugged my celll up and it plays hmmm free.im thinking the radios harness is causin tht because I haven't modified nothing but the dash everything is how it was before I started this upgrade. Here's the loopy part ill plug the pc to an aux input on the HU and no problems
-------------
1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Posted By: DYohn
Date Posted: January 03, 2012 at 11:11 AM
Try grounding the "carputer" to chassis ground in the vehicle. ------------- Support the12volt.com
Posted By: i am an idiot
Date Posted: January 03, 2012 at 11:39 AM
Call around and see if you can find a shop that will let you try a Pac SNi-1. It should fix your problem. It is a directional device, you will need a set of barrel connectors and another RCA cable to install the device the correct way.
Tell them that if it works, you will buy the above items.
There is a ground loop. There is nothing wrong with the puter.
EDIT upon further review, you should not need the Barrels and the RCA cable. Since you are replacing the radio with the PC, just connect the SNi-1's chassis mounted RCA jacks to the RCA cable that used to go to the radio. You may need barrels to connect the Puter to the RCA jacks that are on the cables coming from the SNi-1
Posted By: still_walkin
Date Posted: January 03, 2012 at 11:51 AM
Ok. Ill. Try that. I checked all my ground and they arent loose
-------------
1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Posted By: DYohn
Date Posted: January 03, 2012 at 5:08 PM
Try connecting a wire from the power supply case in the computer to the chassis or amplifier ground. ------------- Support the12volt.com
Posted By: still_walkin
Date Posted: January 05, 2012 at 12:22 AM
its a mini pc and has no screws to take it apart it looks like it snaps together heres a link to what it looks like
https://www./itm/140665883657?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
so i started thinking ground loop and i recently started a new design in the trunk of my car and i kindy just laid out the wires and didnt make the ground as short as they should be and now i have to redo it neatly this time... (shoot myslef in the foot). so my main question is my ground is grounded to the rear right wheel well and from them it splits into a distro block 2(0) guage and 4 (4) guage now only two 4 guages are connected and one 0 will be soon. i also read if the amps arent compatable or similar of such i will have this problem. the amps that are connected are mrp f300 (2) ------------- 1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Posted By: i am an idiot
Date Posted: January 05, 2012 at 8:00 AM
There is nothing you did to create the ground loop. It just happens when the puter is powered from the same source as your amplifiers. Many hours have been spent trying to figure this situation out. The only way we have found to get rid of it is to use the PAC-SNi-1
Posted By: still_walkin
Date Posted: January 05, 2012 at 8:17 AM
Your right but when you said same source cuz I tried it with the pc pulled into the wall and invertor and I got the same results .but im look up that part you suggested
-------------
1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Posted By: still_walkin
Date Posted: January 15, 2012 at 8:59 PM
I figured it out I relocated the invertors ground to the wheel well no issues
-------------
1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Posted By: DYohn
Date Posted: January 15, 2012 at 10:44 PM
Like I said, power supply ground... glad you got it fixed. ------------- Support the12volt.com
|