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Thread: New Inverter Creates Hum

  1. #1
    Newbie
    Join Date
    May 2002
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    New Inverter Creates Hum

    Alright, this is an odd one.

    Originally I had a Jensen JP30 300W power supply, and it worked well. I added a ground loop isolater, and there was absolutely no noise However, as I took a highway exit ramp too fast, the inverter fell off of its perch on me center console, shot out a blue spark and died. The fan turns on, but the light does not illuminate, and it provides no power to the outlets. I checked the fuse, and it is fine. I also opened up the inverter, and nothing seemed drastically wrong (no burnt chips etc.) So I went and bought a new inverter, but bought a Jazz 300 instead of a JEnsen. Once I put this into my system, I started getting horrible buzz, which I did not have with the previous inverter. I have changed nothing but hte inverter. The other strange thing is that I run the line out from the sound card to a hedaphone jack on the front of my head unit. With this new setup, I get the buzzing if the computer is powered on even if I am playing a CD on my head unit. IE, my speakers buzz even when I am not listening to the computers output, but when I unplug it from the head unit, the buzzing stops (naturally). When I had noise issues earlier (withthe other inverter and before the ground loop isolater) it would only buzz when the computer was selected as the input for the head unit.

    Anyone have any ideas? I'm lost

  2. #2
    Newbie
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    Jul 2002
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    H-Town, Texas, USA
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    I can't help you, but just out of curiosity...

    Is it hardwired to the battery (amplifier style), or do you have it hooked up through the cigarette lighter?
    D. R. H. ~alias~ doctaH

  3. #3
    Newbie
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    May 2002
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    Its wired through the lighter, as the JP30 was. It did however come with clips for the terminals, coudl that make a difference?

  4. #4
    Low Bitrate
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    May 2002
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    Wisconsin
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    For some people, hooking it directly to the battery eliminated the hum. And obviously, make sure you ground it.

  5. #5
    Newbie
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    May 2002
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    Well, how about this one:

    I took out the ground loop isolater, and 90% of the noise is gone. I guess it didn't need one, although now it isn't grounded. There is now no engine or alternater related noise, only a high pitched noise that depends on the volume of the head unit. I guess I'll try grounding the entire system tomorrow, and see if that helps.

    Any ideas why the loop was messing the system up?

  6. #6
    Maximum Bitrate eugenen's Avatar
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    Take your old inverter apart aginn. Take the PCB out and flip it upside down. Look around the solder joints of any big/heavy components like capacitors/coils/transofrmers. Resolder any joints that may look weak. Usually what breaks.

  7. #7
    FLAC
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    Apr 2001
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    for the extra noise, try hacking the PSU if u havent done so already.... failing that, what soundcard are u running?

    http://mp3swift.magnetikonline.com/hardware_doc.php
    Project - GAME OVER :(

  8. #8
    Raw Wave Defiler's Avatar
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    Try using this ---> LINK

    I had the same issues and this took care of ALL the noise...
    Aura MR62 (F and R)
    My Current MP3s
    IamDefiler.com

  9. #9
    Maximum Bitrate eugenen's Avatar
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    May 2002
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    Ohio
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    Check some chain pc stores, APC and tripplite make those surge protectors for less price and better quality.

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