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can I interchange laptop power supplies ?

Discussion in 'Electronic Basics' started by Ray Thomas, Sep 19, 2007.

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  1. Ray Thomas

    Ray Thomas Guest

    I have 2 laptops, each requiring 19 volts DC, centre pin on connecting plug
    is + in both cases. One supply is rated at 3.42 A, the other is 4.22 A. Is
    there any foreseeable damage that might occur if I interchange them....is it
    true that the laptop will simply claim the current it requires from the
    supply, so additional Amps will not be a problem (or vice versa in the case
    of underpowering) ? The reason I'm doing this is that one laptop is silent
    with regard to radiated RF noise and hash, whereas the other is plagued by
    it, when I connect an external soundcard.
    Thank you for advice,
    Ray
     
  2. -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    The laptop will _draw_ the numer of amps it needs from its power supply.
    The only danger is if the replacement power supply is rated to a _lower_
    number of amps than the original - the laptop will draw too much power
    from it and may overheat.
    I would think it would be okay to use the bigger supply if it fits =]


    - --
    Brendan Gillatt
    brendan {at} brendangillatt {dot} co {dot} uk
    http://www.brendangillatt.co.uk
    PGP Key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBACD7433
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    =X6wv
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  3. AJ

    AJ Guest

    As posted, the larger current available will not be an issue, however going
    the other direction; using a supply with lower than required current, will
    present problems both in the ability to properly charge the laptop's battery
    and also may not allow the computer to function [properly]. Best recommended
    is to use the supply that was originally designed for the laptop.
     
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