convert flashlight with AAA batteries to plugin DC adapter

Discussion in 'The Projects Forum' started by RCstp, Jan 4, 2013.

  1. RCstp

    Thread Starter New Member

    Jan 4, 2013
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    I have a flashlight with 32 LEDs which runs on 3 AAA batteries. I would like to power this flashlight from an adapter plugged into the wall current. I searched the forum and read other similar discussions but I'm still not sure what output the adapter needs to have. Is there a range that will work, do I need to be concerned about the output voltage and amps? Is there a maximum voltage or amperage that I should avoid so I don't burn out the LEDs?
    Any advice and suggestions are greatly appreciated.

    http://www.harborfreight.com/3-3-4-quarter-inch-32-led-flashlight-98504.html
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
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  3. RCstp

    Thread Starter New Member

    Jan 4, 2013
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    Excellent! Thank You!
     
  4. RCstp

    Thread Starter New Member

    Jan 4, 2013
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    I have a 6 volt 300mA adpater do you think I can use that? Or might it burn out the LEDs? The reply said 4.5v to 5v -minimum- so I'm thinking that 6 volt will be ok. Maybe the LEDs will be brighter?

    Thanks for your help.
     
  5. t06afre

    AAC Fanatic!

    May 11, 2009
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    Very often cell phone chragers is 5 volt. And about 500mA to 1000mA. Everyone has one or more of those lying around
     
  6. wayneh

    Expert

    Sep 9, 2010
    12,145
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    If it's really 6 volts, you're fine. But old wall wart power supplies have open voltages far above the rated (at current load), nominal voltage. If it's a more modern SMPS at a regulated 6v, over-voltage isn't a problem.

    Oh wait! You said 3 AAAs. Hmmm.... 6 volts is a bit much. You might consider a current limiting resistor in series. A 5V USB charger would be better.
     
  7. RCstp

    Thread Starter New Member

    Jan 4, 2013
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    I have several 6 volt adapters so I was hoping I could use them and I don't think I have any old cell phone adapters, but I will check and if I do, I'll try that. However, I have many USB adapters, but I don't understand how to use them. Do I take a USB adapter that plugs into the wall and strip the wires at the USB end and then follow the image at the link below and join the two positive wires and then join the two negative wires and that should give me the proper output?

    http://en.wikipedia.org/wiki/File:USB.svg
     
    Last edited: Jan 7, 2013
  8. RCstp

    Thread Starter New Member

    Jan 4, 2013
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    I figured it out, in the wikipedia diagram, pin 1 is 5 volt, pin, pin 4 is the ground. Thanks for your help.
     
  9. AnnieCarroll

    New Member

    May 18, 2013
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    Were you able to do that? It looks like cool idea even I would love to do that. Waiting for reply. Thanks in advance:)
     
  10. RCstp

    Thread Starter New Member

    Jan 4, 2013
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    Yes, I wired it up and it's working fine and saving batteries.
     
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