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Old 6th June 2005, 06:33 AM   #1
diyAudio Member
Join Date: Jun 2005
Location: Milwaukee, Wi
Default Noise Problem

Hi all, as you are about to find out I only know enough to be dangerous. I listen to music at work by hooking up a boombox to the battery on the equipment I use. When the boombox died (an old JVC with great bass) I tore out all the guts and just stuck a car amp inside, and use an MP3 player for source, everything works great except the battery in the MP3 player won't always last the shift, so I also want to hook it to the big battery powering the boombox. I got a cigarette lighter adapter for the MP3 player and hooked it in parallel to the same battery connection that the car amp is running off of, and when it's all hooked together I get a lot of interference type noise. Everything works great seperately (headphones in MP3 player or alternate source to amp all sound fine) but hooked all together it's got this noise problem. What can I do about it?

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Old 6th June 2005, 07:00 AM   #2
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Join Date: Aug 2004
Location: Earth
Yo, Jackson. How about a car battery? Surely there must be one going begging in Milwaukee?
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Old 6th June 2005, 11:17 AM   #3
diyAudio Member
Join Date: Jun 2005
Location: Milwaukee, Wi
Well that wouldn't be pratical, I have all the battery power I need available, I want to know why hooking these 2 pieces up to the same battery creates some kind of interference.
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Old 6th June 2005, 11:31 AM   #4
Mr Evil is offline Mr Evil  United Kingdom
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Join Date: Aug 2004
Location: Behind you
Ground loop maybe? Try inserting a small resistor (~10 Ohms) in series with the MP3 player's 0V connection to the battery.
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Old 6th June 2005, 06:08 PM   #5
diyAudio Member
Join Date: Jun 2005
Location: Milwaukee, Wi
Thanks, didn't help. This isn't just a humming noise, it's a ripping static with occasional "police siren" type oscillations.
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