Thread: Noise/Buzz in audio Please Help

With the little info that you provided, I can only make an educated guess that the "noise" ought to be coming from your speakers. Could it be a wasp nest or the neighbor's headboard banging on the drywall as they get their groove on?

Elaborate and enunciate with diction in reference to the noise you are experiencing so that we can better assist you. Give us more details.

I thought i'd give you a good chuckle before I answer your question. Google "ground loop isolator." Hope that helps.

Bet wishes and Happy Holidays!

~David

Maybe a rattle snake found its way behind the door panel? I'm just being sarcastic...anyway, are you using an inverter in your car? If so, how is it grounded?

A ground loop occurs when there is more than one ground connection path between two pieces of equipment. The duplicate ground paths form the equivalent of a loop antenna which very efficiently picks up interference currents. Lead resistance transforms these currents into voltage fluctuations. As a consequence of ground loop induced voltages, the ground reference in the system is no longer a stable potential, so signals ride on the noise. The noise becomes part of the program signal making the "Zoooooooo" sound which increases with the rpm.

Are you putting a strain or heavy load on your car's electrical system? It may also be that it's trying to keep up with the demand and that your battery is living on the edge of failure.

Use a multi-meter to test across the battery, tell us what voltage are you reading with the car off, and with the car on.

I obviously overlooked the the fact that you don't have an inverter, my bad.
Do you have a ground loop isolator installed in your system? If not, I suggest you install one. That may very well alleviate the noise you are hearing.
Also the motherboard should be installed on a metal plate properly with stand offs so that it will ground correctly with the other associated parts that were installed.

Keep your ground wires together on one connection when possible, no shortcuts.

is the motherboard mounted on a metal plate or is it inside a computer housing or case?

If none of the above are true then, I'll be the first to tell you, you will end up with a lot of noise issues along the way. Some of which are very hard to troubleshoot in an elaborate setup when worse comes to worse.

As stated in my previous post, the motherboard must be mounted properly using standoffs attached to a metal chasis. Otherwise, you may end up having to ground all of the screw points that are supposed to secure the board.

Furthermore, taking a shortcut by incorrectly attaching wires to the screw points without soldering them and then placing the board on a plastic surface will only make your situation worse.

if it takes for you to accidentally zap your mainboard to learn and heed what I just explained to you TWICE then knock yourself out.

this concludes my assistance