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Thread: Converting from 4.5V battery to 12V for outlet

  1. #1

    Default Converting from 4.5V battery to 12V for outlet

    So, I'm trying to convert an LED circuit so that it can be plugged into the wall. Currently, the circuit is running off a 4.5V battery pack. My intuition tells me (I'm very new with making circuits and all) that I just need to throw a resistor on the line and solder some unused plug to the end of the wires. Am I wrong? Will I electrocute myself with this thing?

  2. #2
    Flashaholic* Christoph's Avatar
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    Default Re: Converting from 4.5V battery to 12V for outlet

    No do not do that there will be someone bye soon to help better than I but don't do that. With out more info you will need some type of a rectification circuit and current control at least in order to do what you want.
    C
    Chris

  3. #3
    Flashaholic balou's Avatar
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    Default Re: Converting from 4.5V battery to 12V for outlet

    You do realize that a wall outlet does NOT have 12V?
    12V is safe to touch - the 100-250V from a wall outlet could kill you in the worst case.

    edit:
    Quote Originally Posted by preatomic bean View Post
    Will I electrocute myself with this thing?
    Yes, with your current knowledge I'm afraid so.

    Some of the bigger problems:
    -wall power is AC, batteries are DC
    -a resistor would dissipate way to much heat

    A solution would be an old cellphone charger and a resistor. Easy to get and no dangerous voltages
    Last edited by balou; 12-31-2009 at 08:46 AM.
    This space intentionally left blank

  4. #4
    *Flashaholic* mdocod's Avatar
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    Default Re: Converting from 4.5V battery to 12V for outlet

    Just buy a ~4.5V DC transformer (wall-wart). If the LED rig is buck regulated then a minor change in input voltage shouldn't be too much of a problem, just make sure the wall-wart is rated to deliver the current required.

    If you don't know what I am talking about, then the answer is, no, don't try it, ask more questions.

    Eric
    -Eric

  5. #5
    Flashaholic* LukeA's Avatar
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    Default Re: Converting from 4.5V battery to 12V for outlet

    Go to digikey and find a switching power supply with the right voltage and 20% more current capacity.

    I think the ones I have are made by CUI.

  6. #6
    Flashaholic* TorchBoy's Avatar
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    Default Re: Converting from 4.5V battery to 12V for outlet



    You seem a little vague on some details, like how your LED is presently running on 4.5 V. What outlet are you talking of that has 12 V?
    No, a torch does not always mean flames.
    Ian.
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  7. #7

    Default Re: Converting from 4.5V battery to 12V for outlet

    Really - designing electronics by intuition will always be a spectacular fail.

    Adding mains voltage to the mix is likely to add a lethal component to that fail.

    I second the advice above - get a PSU (wallwart/laptop psu or whatever) to do the dangerous stuff down to low voltage, and work from there. At least then the worst you can do is kill a few electrical components.
    ****
    Tony

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