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Thread: The quest for no noise

  1. #11
    Retired Admin Aaron Cake's Avatar
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    Cool

    I think a lot of people would agree with me when I say that the first step in getting rid of noise is to replace then inverter with a DC-DC converter. DC-DCs by their nature are noise free, while inverters are by nature noisy.

    As far as grounding goes, it has always been better to keep ground leads as short as possible. That way there is less chance of picking up noise.

    Also, with respect to alternator whine, it can sometimes be a sign of a dying alternator, rectifier, or voltage regulator.

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    Aaron Cake
    London, Ontario, Canada

    Player: Cyrix 200, 32MB RAM, 10.2Gig Quantum HD, Onboard EtherNet/Sound/Video, Custom Lexan Case, Arise DC-DC, Win95 Kernal w/Custom Player
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    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  2. #12
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    Aaron Cake,

    I'm sure that the people using inverters, including myself, are not going to switch to dc-dc ps's. I'm sure there still has to be away to get rid of any inverter noise, if there's any at all, depending on your inverter.

    I know that I can cancel out a dying alternator for engine whine because my car is brand spankin' new. Today I'm going to sand and polish the grounding spot and see if that makes a difference.

    Update: Well, I did a bit of rewiring and fixing up ground points and whatnot, but still had the same old engine whine and slight hum. I went to radio shack and bit the big one and bought the ground loop isolator. No whine or noise at all. I'm extremely excited and best of all, I don't hear any lose of sound quality (but then again, I don't play my music at ear bleeding levels).

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    www.geocities.com/blkdragon6

    [This message has been edited by blkdragon6 (edited 11-02-2000).]

  3. #13
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    Sorry about the delay since the last post guys. Been busy trying to take care of a dim LCD and fuzzy TV tuner card.

    First, to Tekati, I am not trying to start a fight here, but using a device so that you don't have to install something "the right way" is a bad practice. I understand that some people can get away with doing that, but not all can and in general it is a bad pratice. I use an APC back up ups to power my carputer. It is with out a fan. I am still unsure of the generation of the hum. I have since taken the carputer out of my truck(broken LCD at the moment. Carputer wasn't properly install yet, so I removed it for now). I know that I will eb able to get rid of the noise somehow.

    This is to Dima. I am using crossovers. They are passive. I think they are 18db also. I could not tell if the sound was coming from all the speakers or just the tweeters. They have the highest level played through them right now. Most of my other speakers are attenuated to some degree. They are also closer to ear level and aimed toward my ears.

    Blkdragon6, I am very glad that you got rid of the noise in your system. I am going to probably do the same thing to my setup. I will go through my installion first and make sure everything is up to spec there first. I think my battery ground needs to be addressed. I need to purchase a pair of those good battery terminators for my system. Truck sometimes didn't want to start till i twisted the clamp on the post a bit. I have since fixed that and the truck starts fine, but sometimes, I think that I can hear a slight whine in the cd player. This is of course after I replaced the 10 gauge wire in my system with 4 gauge. I grounded to a different point and think I may have issues there. I have a few places that I can check out.

    When I find my solution to the inverter noise I will definenatly share with everyone else.

  4. #14
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    blkdragon6: Just because your car is new doesnt mean a thing about whether your alternator might be going out. I'm not saying it is or isnt or anything...but after working a truck chassis plant for a couple weeks...well just trust me things go on you wouldnt want to know about....

  5. #15
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    I can vouce for that. My wife has a 2000 Mustang and we bought it in May. Was a special order so I know that it was built with in a month of may. Her fan motor is making a really annoying squeal the higher the ac/heater is going. But with a custom setup like you are doing, you might want to not let them see what you are trying do with your new car, or they might void your warrenty. They suck!

  6. #16
    Retired Admin Aaron Cake's Avatar
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    Originally posted by Catlas:
    ...well just trust me things go on you wouldnt want to know about....
    OK. I have to ask. Like what? :-)

    ------------------
    Aaron Cake
    London, Ontario, Canada

    Player: Cyrix 200, 32MB RAM, 10.2Gig Quantum HD, Onboard EtherNet/Sound/Video, Custom Lexan Case, Arise DC-DC, Win95 Kernal w/Custom Player
    Car: '86 Mazda RX-7 w/Basic Performance Upgrades
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  7. #17
    Constant Bitrate
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    Originally posted by Rifken:

    When I find my solution to the inverter noise I will definenatly share with everyone else.
    Have you tried running and extra gound wire from whatever your inverter is running to the chassis. (i.e.- connect a ground wire from a grounding point on the computer, to a suitable grounding location on the chassis)

  8. #18
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    I know that an ground loop isolator is a sign of a weak link in the setup, but all I can say is that it's working wonders for me. The only noise that I can hear when the engine is off and the music isn't playing is the sound of the fans of the computer and inverter, and even that is barely audiable. So I'm not saying the GLI is the best solution, but it's by far the simplist and non-headache causing solution. When time permits, I'll try to look into rewiring the system to eliminate the problem the correct way.

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  9. #19
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    Unhappy

    Well I guess my excitment was premature. I was washing and waxing and put on the player and have a loud hum. Strange thing is that if the engine is running there is no noise??? Anyone have a clue how that is. I am running an inverter but why would you have noise without the engine running and none with it on. It used to be the reverse before running the ground to the battery????

  10. #20
    FLAC DodgeCummins's Avatar
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    Remember the computer itself makes noise. (that 200-800 Mhz thingie) If it isn't RFI shielded then that noise will travel throughout your wiring harness. So far I am just testing, but with my laptop hooked up, using a DC-DC mobile adapter, all I hear is a white noise type buzz at a very low volume (kind of like a hiss).

    I guarantee that at 60hz inverter will make a lot of noise right in the listening range. (without adequate shielding)

    You know the aviation industry spends a lot of time and money on properly sheilding equipment like this for the same reasons.



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