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Charger / Power Pack

Discussion in 'General Electronics Discussion' started by spike47, Jun 2, 2012.

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  1. spike47

    spike47

    11
    0
    Aug 11, 2009
    Hi

    I buy Broken Laptops and Repair them ( not all ! ) as a hobby , the question I have at the moment is that I have a Laptop repaired and ready to fire up , but I do not have the correct charger / power supply for it .

    It requires a 19V 4.5A supply , now I have a couple of chargers but they have a 19.5V 4.5A output , would that extra 0.5 V make such a difference as to blow the Laptop ! .

    thanks

    spike
     
  2. davenn

    davenn Moderator

    13,833
    1,950
    Sep 5, 2009
    Hi Spike
    welcome to the forums :)

    not likely as most laptops have a bunch of voltage regulators in them anyway to produce the required various DC rails.

    i would suspect that + - 0.5V would most likely be well within the specs of the supply anyway

    Dave
     
  3. davenn

    davenn Moderator

    13,833
    1,950
    Sep 5, 2009
    dang mate

    I just noticed your join date ! where have you been hiding for the last 3 years

    Dave
     
  4. spike47

    spike47

    11
    0
    Aug 11, 2009
    Hi davenn

    Thanks for your reply , I am very tempted to use the other power pack's but I still need a bit info as to whether it will be ok , I am more or less 100% sure it will be , the reason I am dithering is that I checked the Voltage of the spare power packs I have and they showed one at 19.8V and the other at 19.9V , so I am talking about nearly a 1V difference now , yes i know I should just go and buy a new one for a couple of our £s , but I like to push and try things out its just me .

    cheers

    spike
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
    2,837
    Jan 21, 2010
    19.8 and 19.9? that's only 0.1 volt.

    Perhaps you mis-typed.
     
  6. khankll

    khankll

    110
    0
    Feb 6, 2011
    that is not a big difference i have tried such thingas in past have had no issue..

    however if u damn want to reduce it then a power diode which can easily handle this current can be attached in series.. diodes often have .5v forward voltage drop.. in this case u will get exact voltage that u want..
     
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