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Thread: Strange problem

  1. #1
    Newbie Toehead's Avatar
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    Strange problem

    Let me start off and say that I did search, and my problem is odd in that it is the reverse of any that I could find when searching.


    I got rid of all of my speaker noise for the most part. HOWEVER, I get alternator whine when listening to the headunit with the carputer off. If I turn the carputer on, silence. Not a hint of noise, and my amp is turned up.

    Specs are as follows:
    dell laptop, powered through invertor and ac power supply
    sony x-plod craptastic deck.
    all monster cable speaker wires/rca's
    run to a kenwood 600w amp which powers the speakers.
    All audio equipment is run to a common ground (although the deck ground is a bit long... I took it off the chassis and ran it all the way to the back with thick wire, not sure of AWG, to ground in a common spot with everything else in an attempt to get rid of the noise. Didn't make a difference. )


    The noise is only with the carputer off. It doesnt matter whether or not the headunit is on, as long as it is plugged in it makes the noise.
    The signals are mixed by a simple audio mixer (shielded) which I made on a radioshack board.
    I don't think it is my mixer because if the carputer is on, there is absolutely no noise at all.

    If I disconnect the RCA's from the deck, the noise also dissapears.


    Any ideas?
    1985 Camaro Berlinetta, black with t-tops
    500 MHZ dell CP Series
    MP3 and ALDL data monitoring/wireless internet
    kenwood 600 watt amp, powering pioneer 3 way speakers

  2. #2
    MySQL Error scott_fx's Avatar
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    Quote Originally Posted by Toehead
    Let me start off and say that I did search, and my problem is odd in that it is the reverse of any that I could find when searching.


    I got rid of all of my speaker noise for the most part. HOWEVER, I get alternator whine when listening to the headunit with the carputer off. If I turn the carputer on, silence. Not a hint of noise, and my amp is turned up.

    Specs are as follows:
    dell laptop, powered through invertor and ac power supply
    sony x-plod craptastic deck.
    all monster cable speaker wires/rca's
    run to a kenwood 600w amp which powers the speakers.
    All audio equipment is run to a common ground (although the deck ground is a bit long... I took it off the chassis and ran it all the way to the back with thick wire, not sure of AWG, to ground in a common spot with everything else in an attempt to get rid of the noise. Didn't make a difference. )


    The noise is only with the carputer off. It doesnt matter whether or not the headunit is on, as long as it is plugged in it makes the noise.
    The signals are mixed by a simple audio mixer (shielded) which I made on a radioshack board.
    I don't think it is my mixer because if the carputer is on, there is absolutely no noise at all.

    If I disconnect the RCA's from the deck, the noise also dissapears.


    Any ideas?

    first thing to do to trouble shoot it is disconnect the mixer. wire the h/u straight to the amp and then wire the pc straight to the amp.. do you still have the noise?
    New System in progress:
    M10k
    Phaze TD1500 ~> Dynaudio MD130
    Phaze TD1500 ~> Seas g18rnx/p
    Zapco Ref 500.1 ~ 12" tc-9
    Behringer DCX2496 ~ Envision Electronics psu
    Transflective Xenarc

    My Car Pc Install
    My Boat Pc worklog

  3. #3
    Newbie Toehead's Avatar
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    nope. Only with both connected does the noise occur.
    1985 Camaro Berlinetta, black with t-tops
    500 MHZ dell CP Series
    MP3 and ALDL data monitoring/wireless internet
    kenwood 600 watt amp, powering pioneer 3 way speakers

  4. #4
    MySQL Error scott_fx's Avatar
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    Quote Originally Posted by Toehead
    nope. Only with both connected does the noise occur.

    then it has something to do with your mixer. i'm not sure how it was built or even how to trouble shoot that... hmmm anyone?
    New System in progress:
    M10k
    Phaze TD1500 ~> Dynaudio MD130
    Phaze TD1500 ~> Seas g18rnx/p
    Zapco Ref 500.1 ~ 12" tc-9
    Behringer DCX2496 ~ Envision Electronics psu
    Transflective Xenarc

    My Car Pc Install
    My Boat Pc worklog

  5. #5
    Newbie Toehead's Avatar
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    Why then does the noise only happen when the carputer is off? Should I ground the negative prong of the dc power cable which plugs into the laptop? The adapter is powered at all times.
    1985 Camaro Berlinetta, black with t-tops
    500 MHZ dell CP Series
    MP3 and ALDL data monitoring/wireless internet
    kenwood 600 watt amp, powering pioneer 3 way speakers

  6. #6
    MySQL Error scott_fx's Avatar
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    Quote Originally Posted by Toehead
    Why then does the noise only happen when the carputer is off? Should I ground the negative prong of the dc power cable which plugs into the laptop? The adapter is powered at all times.

    just a stab in the dark but it seems as though the mixer needs two active inputs. do you have an mp3 player? try removing the laptop and plugging in the mp3 play ro the mixer see if you get the same results that you did with the laptop plugged in
    New System in progress:
    M10k
    Phaze TD1500 ~> Dynaudio MD130
    Phaze TD1500 ~> Seas g18rnx/p
    Zapco Ref 500.1 ~ 12" tc-9
    Behringer DCX2496 ~ Envision Electronics psu
    Transflective Xenarc

    My Car Pc Install
    My Boat Pc worklog

  7. #7
    Newbie Toehead's Avatar
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    Will try. Thanks for the tips, keep em coming.
    1985 Camaro Berlinetta, black with t-tops
    500 MHZ dell CP Series
    MP3 and ALDL data monitoring/wireless internet
    kenwood 600 watt amp, powering pioneer 3 way speakers

  8. #8
    Newbie Toehead's Avatar
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    Nope, no whine when connected to a battery powered mp3 player directly.
    1985 Camaro Berlinetta, black with t-tops
    500 MHZ dell CP Series
    MP3 and ALDL data monitoring/wireless internet
    kenwood 600 watt amp, powering pioneer 3 way speakers

  9. #9
    MySQL Error scott_fx's Avatar
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    Quote Originally Posted by Toehead
    Nope, no whine when connected to a battery powered mp3 player directly.

    just to get it straight you had the mp3 player and the radio hooked up to the mixer, correct?
    New System in progress:
    M10k
    Phaze TD1500 ~> Dynaudio MD130
    Phaze TD1500 ~> Seas g18rnx/p
    Zapco Ref 500.1 ~ 12" tc-9
    Behringer DCX2496 ~ Envision Electronics psu
    Transflective Xenarc

    My Car Pc Install
    My Boat Pc worklog

  10. #10
    Newbie Toehead's Avatar
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    no i had the carputer and the mp3 player hooked up....
    1985 Camaro Berlinetta, black with t-tops
    500 MHZ dell CP Series
    MP3 and ALDL data monitoring/wireless internet
    kenwood 600 watt amp, powering pioneer 3 way speakers

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