Thread: Buzzing noise help

Try a ground loop isolator.

Also, check your ground is good. Common error is the power ground being a worse ground than the RCAs' sheilding, hence that's used for ground which equals noise.

In addition, inverters tend to introduce a 50hz noise to the power (square sine wave for AC instead of analogue curve) which CAN be OK if you don't have ground problems or EFI issues.

First port of call is ground loop isolator.A multimeter is also invaluable to check the resitance to ground on all your paths to ground so you can make sure the power supply ground is the lowest resistance.

Oh, just saw you're in birmingham. I'm there every day Took my car into Bristol street half way through the last build if he works there he might have seen it

STEVIE G no way my mate works in Wolverhampton and I will check my ground but im pretty sure its good. The funny thing about it all is that if I hook up the pc straight to my mains at home the buzzing goes which leads me to believe its an inverter problem. More investigations tonight after work anyways!

Hey guys im still needing more help. I still cant get rid of the buzzing noise and its doing my head right in now so im geting desperate! The buzzing does not come on when the car is powerd from the mains from my house and dosnt come on if the input ISNT the car pc but a external mp3 player. I checked my grounds and they seem fine and i tried another inverter yesterday and that did the same thing. Due to the power cable being that of the Sumicomm/Xenarc/IWill Case Power Cable mother boards its really hard to find another powerin alternative apart from the carnetix box which i bought but was faulty so dont really wanna use them again. Any otehr thoughts? Maybe a filter that will get rrid of the sound for me or a alternative power source or ANYTHIN????

You know..... you could seriously wrap your little speaker amplifier box that has the buzzing in foil and it should get rid of all of the EMI that could possibly be generated around the car. If you just ground it though, it would get rid of it. Try running a wire from the metal casing of the amplifier to your chassis. That should do it.

Sorry dude I htink I need to elaborate more. The amplified graphic equaliser which is powering the doorcard speakers makes them buzz when I connect it to the car Pc but not when i connect it to my external mp3 player. Everthin is grounded ok else surely I would still get same buzzing sound when I hooked up the portable Mp3 player

what kind of setup are you running on? i used to run an inverter setup through my shuttle pc, and the buzzing came from my power supply. whenever it ran on the inverter the buzzing was there, but when i plug it in my house the buzzing stopped. changed my power supply (still ac-dc) and the problem was solved.

What do you mean changed your power supply did you get a new inverter?? Cheers
Fletch

It definately sounds like a grounding issue.

Try plugging some headphones into the line-out socket when it's powered from the invertor and see if you get the buzzing.