12 volt Mains adaptor - query re amps

Discussion in 'Electronic Basics' started by matt, Apr 17, 2006.

  1. matt

    matt Guest

    The mains adaptor for my router (a Cisco Wireless-G WAG54G) has just
    died a death - the router's power requirements are 12volts at 1amp. I
    have a spare 12volt mains adaptor but it's only rated at 500mA. I've
    tried it and all seems well, but am I likely to experience problems
    using it with the 1amp router?

    If so, would the worst thing to happen be the failure of the mains
    adaptor?

    Just to be on the safe side, should I obtain one rated at 1 amp?


    Thanks
     
    matt, Apr 17, 2006
    #1
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  2. matt

    Ryan Weihl Guest

    matt wrote:

    > The mains adaptor for my router (a Cisco Wireless-G WAG54G) has just
    > died a death - the router's power requirements are 12volts at 1amp. I
    > have a spare 12volt mains adaptor but it's only rated at 500mA. I've
    > tried it and all seems well, but am I likely to experience problems
    > using it with the 1amp router?
    >
    > If so, would the worst thing to happen be the failure of the mains
    > adaptor?
    >
    > Just to be on the safe side, should I obtain one rated at 1 amp?
    >
    >
    > Thanks


    does it get hot????

    --
     
    Ryan Weihl, Apr 17, 2006
    #2
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  3. matt

    Ryan Weihl Guest

    matt wrote:

    > The mains adaptor for my router (a Cisco Wireless-G WAG54G) has just
    > died a death - the router's power requirements are 12volts at 1amp. I
    > have a spare 12volt mains adaptor but it's only rated at 500mA. I've
    > tried it and all seems well, but am I likely to experience problems
    > using it with the 1amp router?
    >
    > If so, would the worst thing to happen be the failure of the mains
    > adaptor?
    >
    > Just to be on the safe side, should I obtain one rated at 1 amp?
    >
    >
    > Thanks


    does it still produce 12volts. what AC or DC??

    --
     
    Ryan Weihl, Apr 17, 2006
    #3
  4. matt

    John Fields Guest

    On Mon, 17 Apr 2006 19:46:54 GMT, (matt)
    wrote:

    >The mains adaptor for my router (a Cisco Wireless-G WAG54G) has just
    >died a death - the router's power requirements are 12volts at 1amp. I
    >have a spare 12volt mains adaptor but it's only rated at 500mA. I've
    >tried it and all seems well, but am I likely to experience problems
    >using it with the 1amp router?


    ---
    More than likely what'll happen, long term, is that you'll overheat
    the transformer in the adaptor and it'll fail prematurely. Also,
    you could exceed the ripple current spec of the reservoir capacitor,
    causing it to fail prematurery.
    ---


    >If so, would the worst thing to happen be the failure of the mains
    >adaptor?


    ---
    Who knows? if it's not fused and it overheats and catches fire,
    there might go your house.
    ---

    >Just to be on the safe side, should I obtain one rated at 1 amp?


    ---
    Of course.

    --
    John Fields
    Professional Circuit Designer
     
    John Fields, Apr 17, 2006
    #4
  5. matt

    matt Guest

    On Mon, 17 Apr 2006 15:37:12 -0500, John Fields
    <> wrote:


    Thanks for the replies - I'll buy one rated at 1A then. :)

    BTW, it's 12 volts DC.
     
    matt, Apr 17, 2006
    #5
  6. matt

    Rich Grise Guest

    On Mon, 17 Apr 2006 19:46:54 +0000, matt wrote:

    > The mains adaptor for my router (a Cisco Wireless-G WAG54G) has just
    > died a death - the router's power requirements are 12volts at 1amp. I
    > have a spare 12volt mains adaptor but it's only rated at 500mA. I've
    > tried it and all seems well, but am I likely to experience problems
    > using it with the 1amp router?
    >
    > If so, would the worst thing to happen be the failure of the mains
    > adaptor?
    >
    > Just to be on the safe side, should I obtain one rated at 1 amp?
    >


    Yes - that's the proper way to do it. You say you've tried the 500 mA
    adapter and it "seems" well, but I'd check how hot it's getting - if
    you only run the router at 50% duty cycle or less, you might get away
    with it, at least until the adapter melts. ;-)

    Good Luck!
    Rich
     
    Rich Grise, Apr 17, 2006
    #6
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