MP3Car.com - View Single Post - FAQ: Getting Rid of that Whine or Buzzing Noise in Your Speakers

carabuser · 07-10-2005, 05:00 PM

Getting Rid of noise using POWER INVERTER:
The main idea: ground EVERYTHING POSSIBLE that runs from the inverter.

My experience: Using a laptop and Lilliput 7" both powered by an inverter (from sig. lighter). A lot of noise in the speakers, a lot of noise on the screen as well.
Solution:
1. Grouning the screen (yes, screen does make noise): simply take the negative line from the screen's power adapter and ground it.
2. Grounding the laptop: same thing, take the negative line from the laptop power adapter and ground it to the chassis.

My two grounding points for laptop and screen are at two different locations but there's NO noise when the system is on.

However, there's still loud noise when I turn the laptop off.

EDIT: This might sound stupid to those of you who's been in "business" for a while, but I'm sure people with less experience can use it: use HIGH quality cables. In my case I'm using a cheap radioshack cable to connect laptop to my HU and over time quality went down and I can hear a lot of noise now.

07-10-2005, 05:00 PM	#9
carabuser Maximum Bitrate Join Date: Aug 2003 Location: CA Vehicle: 2000 Nissan MAXIMA Posts: 461 My Photos: ()	Getting Rid of noise using POWER INVERTER: The main idea: ground EVERYTHING POSSIBLE that runs from the inverter. My experience: Using a laptop and Lilliput 7" both powered by an inverter (from sig. lighter). A lot of noise in the speakers, a lot of noise on the screen as well. Solution: 1. Grouning the screen (yes, screen does make noise): simply take the negative line from the screen's power adapter and ground it. 2. Grounding the laptop: same thing, take the negative line from the laptop power adapter and ground it to the chassis. My two grounding points for laptop and screen are at two different locations but there's NO noise when the system is on. However, there's still loud noise when I turn the laptop off. EDIT: This might sound stupid to those of you who's been in "business" for a while, but I'm sure people with less experience can use it: use HIGH quality cables. In my case I'm using a cheap radioshack cable to connect laptop to my HU and over time quality went down and I can hear a lot of noise now. __________________ 2000 Maxima CarPC Current Status: Rebuilding Specs - 1.5Ghz Toshiba Laptop - Indash Motorized 7" VGA TS - DeLorme GPS - Power Inverter - Pioneer HU Last edited by carabuser : 09-21-2005 at 09:31 PM.