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simple but not working - help !

Discussion in 'Electronic Repair' started by sparhawk, Jun 4, 2005.

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  1. sparhawk

    sparhawk Guest

    Hi all,


    I have a creative surroundsound system connected to my computer.
    A few days ago the adapter stopped working. So i bought a new adapter with
    the same specs.


    Original adapter: 12V AC , 4.2A max
    New adapter : 12V AC , 6A max


    I took the plug and connected the 2 wires from the new adapter to the plug,
    brown and blue wire. Then i shielded them with special tape.


    When i plug into the subwoofer i get alot of noise through all speakers,
    sounds like tearing alot of paper. So i quickly unplugged it.




    Now guys, what did i do wrong ?


    If for example the new adapter outputs not 12V but 13.8V ... could that be
    causing this problem ?




    Thank you for any advise !
     
  2. Ron(UK)

    Ron(UK) Guest


    Could it be that the old adaptor stoppped working because there is a
    fault with the speakers which is overloading the new adaptor, or , are
    you sure the old adaptor was AC and nor DC?

    Ron
     
  3. sparhawk

    sparhawk Guest




    Hello Ron,

    Trust me, i triple checked and got the original even here on my desk.

    By the way, this is the link to the creative set i have with some
    specifications:

    http://www.creative.com/products/product.asp?category=4&subcategory=464&product=55&nav=2

    The new adapter is not one of those heavy ones but rather uses
    electronic components to do its job. Dunno if that might be a problem.
     
  4. NSM

    NSM Guest

    That doesn't sound like an AC output adaptor. They MUST use a heavy
    transformer. Can you post the label for the new supply?

    N
     
  5. sparhawk

    sparhawk Guest

    Hi !

    This the information of the new supply:

    (translated)

    E.611955 - AC powersupply 12V-75W
    AC powersupply / Halogeen Transformer - 12 Volt - 75 Watt.

    Input: 230 Volt
    output: 12 Volt ac - max. 75 Watt


    What you think ? This one is very light compared to the original in
    weight, but that is because it uses electronic components to do the job
    or so.
     
  6. Ron(UK)

    Ron(UK) Guest

    Yes it could be, a cheap switch mode psu might produce a lot of hash
    that the amplifier doesn`t appreciate.


    Ron
     
  7. Ron(UK)

    Ron(UK) Guest

    Hold on.. do they actually make ac to ac switch mode psu`s? A quick
    scan through a large electronics supply catalogue doesn`t show any.

    Ron
     
  8. If that is a switcher, take it back and get a real transformer.

    There's all sorts of switching noise that's not going to be filtered by
    a typical amplifier.

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  9. Sure, but it is meant to power halogeen bulbs, not an amplifier. Lamps are
    not critical for waveform and frequency but the rectifier and regulator of
    your amplifier are. The electronics you mention consist of a high frequency
    switcher and I should not be astonished the 12VAC it produces to be some
    tenth of kHz and far from sinusoidal.

    petrus bitbyter
     
  10. James Sweet

    James Sweet Guest

    Ah, when you said electronic components I wondered if you were trying to use
    a halogen transformer. Those don't put out 50 (or 60) Hz, they're more like
    a triac light dimmer. I'm very surprised you didn't get smoke and fireworks
    when you plugged in the speakers. You need a magnetic transformer, not a
    switchmode lamp regulator.
     
  11. NSM

    NSM Guest

    Yes. Do not use this. Find a good solid AC transformer type. A lamp is a
    resistive load and can run off many different sources that can fry your
    system.

    N
     
  12. sparhawk

    sparhawk Guest


    Guys, thanks alot for the good advise and your time !

    I'm going to bring this thing back and get a normal transformer (no
    halogeen stuff). I hope i can find an ac - ac transformer, else i'll
    have to see if i can get one from creative itself.

    Thanks again !
     
  13. James Sweet

    James Sweet Guest


    Those halogen "transformers" are pretty useful for other things, if you wire
    one to a car ignition coil you can get some pretty decent sparks.
     
  14. NSM

    NSM Guest

    Maplin's or similar? Maybe even Radio Shack?

    N
     
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