DC in place of AC

Discussion in 'General Electronics Chat' started by hacksign23, Sep 20, 2010.

  1. hacksign23

    Thread Starter New Member

    Sep 20, 2010
    3
    0
    Okay so i was wondering.
    I have an AC to DC adapter (plug) and i was wondering if it would be okay if i just put a battery in contact with the plug.
    would that work?

    ex: i have a laptop that has an ac to dc adaptor. if the input i had was 10v 10a, then would the adaptor be okay?
    thanks.
     
  2. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    No, for obvious safety reason.

    Anything in contact with the battery will either charge it or discharge it. In your case, if the voltage of the battery is lower than the adapter output then the adapter will charge it non-stop until the battery explode.

    The usual practice is to SELECT either the battery or the adapter output, via a switching mechanism inside the DC socket.
     
  3. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,783
    944
    if you mean going straight to the input with a battery, then yes that can work. It would mean cutting the wires to get at the device input.

    If you are talking about putting DC into the input of the AC converter then it wouldn't work.

    I think a picture of your idea is called for so we know for sure what you are talking about.


    [​IMG]
     
    Last edited: Sep 20, 2010
  4. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    Are you trying to operate a laptop off a battery instead of the adapter that came with it? If so, no problem, the DC input jack on a laptop typically accepts a car cord to run it off 12V and still keep the internal battery charged. Most laptops have a regulated buck/boost power supply circuit built into them.

    I've seen all different voltages from the actual supplies that come with laptops yet never seen one that wouldn't work with pure 12V going into it. I think even Radio Shack has the car cord adapters.
     
  5. hspalm

    Active Member

    Feb 17, 2010
    201
    8
    Would you rather not connect a battery charger where you cut the wire, then connect the battery in parallel with the wire after the charger? He has not said anything about what type of battery to use, so how can you say it is safe to have a constant power source connected to the battery (say its another/spare laptop lithium battery) ?
     
  6. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,783
    944
    I tend to give the poster credit for at least a partial brain in his head. If someone comes here and asks about battery/replacements for AC adapters, one has to think he has a rudimentary knowledge of electricity, at least enough to attempt what he is asking about. If they DON'T have a clue which end of the electron goes up, and do something ANYWAY then too bad for them! Life has a way of teaching people what their limitations are. People MUST learn that endeavors which are beyond their scope of knowledge should be left to someone else. That's why we have special businesses like plumbers and electricians!

    :)

    If my pipes get clogged I KNOW better than to try fixing it myself because I haven't the slightest clue how to do any of that stuff. Should I try it anyway and screw it up worse, then a 'specialist' will be happy to come along and separate me from my money to fix my flub up

    Simple Pimple baby
     
  7. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    If my pipes get clogged I KNOW better than to try fixing it myself because I haven't the slightest clue how to do any of that stuff. Should I try it anyway and screw it up worse, then a 'specialist' will be happy to come along and separate me from my money to fix my flub up

    That's the reason you never want to try and schedule a routine plumber visit on a Monday,
    they're too busy fixing what people have messed up during the weekend.
     
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