Super Bright led flashlight

Discussion in 'The Projects Forum' started by CircuitMaker123, Jul 17, 2010.

  1. CircuitMaker123

    Thread Starter New Member

    Jun 13, 2009
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    Hello, I am fairly new to electronics. I am trying to make a super bright led flashlight and in the process of buying the materials I bought a Lights of America 2001LED53IN-65K LED Bulb only to find out that I it ran off AC. Now, I want to power a 12v 105 mAh ac led bulb with a dc power source. How can I do it the simplest way?

    I could try opening it to modify it but I don't want to risk voiding the warranty.

    If you suggest using an ac to dc converter can you please suggest a circuit?

    Thanks!
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,646
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    Hello,

    Do you have a link to the datasheet?
    This way we can see if there is an alternative way of powering the lamp.

    Bertus
     
  3. CircuitMaker123

    Thread Starter New Member

    Jun 13, 2009
    8
    0
    I have tried many times to search for data sheets but cant find it.
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,765
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    Have you tried feeding it current? Start with 20ma to be safe, it will tell you if you need AC or not. It may be possible this has a diode bridge built in. Minor bad news, you will likely have to up the battery voltage to compensate if it does. If it doesn't I can show you how to build a circuit that will drive it.

    I contacted the parent company, they say I'll have an answer in 48 hours. We'll see.
     
    Last edited: Jul 18, 2010
  5. CircuitMaker123

    Thread Starter New Member

    Jun 13, 2009
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    0
    I tried feeding it 75mAh with about 27 volts and nothing happened, that's how I realized it must use AC.
     
  6. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    If you look on this page it says 12VAC/60Hz >> http://lightsofamerica.com/en/Products/2001LED53IN-65K.aspx near the bottom where it says specifications...

    Since this is an MR16 replacement bulb you should look at the low voltage MR16 specs...
    http://en.wikipedia.org/wiki/MR16


    these LED lights must have the rectifier built in in order for it to be AC powered...
    B. Morse
     
    Last edited: Jul 18, 2010
  7. Wendy

    Moderator

    Mar 24, 2008
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    Did you feed it both ways? It may use a capacitor to limit current.

    In that case, would a 60 Hz 24VAC P=P square wave work you think?
     
  8. someonesdad

    Senior Member

    Jul 7, 2009
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  9. Wendy

    Moderator

    Mar 24, 2008
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    I think the OP wants a flashlight. It would be overkill to build circuitry, it would be cheaper just to buy another bulb. However, I'm working on some similar stuff right now, for inverters. Just replace the transformer with your LED bulb and it would work.
     
  10. williamj

    Active Member

    Sep 3, 2009
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  11. Wendy

    Moderator

    Mar 24, 2008
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    OK, got a reply, but I suspect it is less than helpful.

    According to these guys it should take 12VDC, which the OP has tried. Since it is 1W it will pull around 83ma. This implies it should work with at least one polarity on the leads. I'm inclined to believe the OP, I've had too many quick answers from places like this. Having said this, it might be worth repeating your experiments.

    Did you use a resistor? I suspect it is included in the package since it is meant to replace an existing bulb, but they didn't say.
     
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