LED circuit for Megaman costume need help please!

Discussion in 'The Projects Forum' started by Iscaria, Sep 14, 2011.

  1. Iscaria

    Thread Starter New Member

    Sep 14, 2011
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    0
    So this year I decided to go as Megaman for Halloween. There's no good costumes you can buy, but I found a guy who made one for his kid at http://www.instructables.com/id/Mega-Man-Costume/

    I won't be rocking the full costume, just the buster cannon. Unfortunately I haven't held a soldering iron since 8th grade so my calculations for a complete circuit are gonna be way off. I already purchased the parts from Radioshack and I wanted to see if anyone could help me with setting them up or picking out new parts if the ones I got aren't good.

    My materials right now include:
    25-watt soldering iron
    Lead-free .032" 96/4 silver-bearing solder
    Four 5mm yellow LED's
    Back of the package lists them as follows:
    Forward (Supply) Voltage: 3.0 VDC max
    Luminous Intensity: 55mcd
    Peak emission: 585 typ.
    20mA
    One Jumbo Super-Bright 10mm Red LED
    Back of the package lists it as follows:
    Absolute maximum ratings
    Forward current: 40mA max
    Forward voltage: 5VDC max
    Reverse voltage: 6VDC
    Power dissipation: 100mW
    Electro-optical characteristics
    Forward voltage: 2.4V +or- .03V
    Peak emission: 660nm
    Luminous Intensity: 5000mcd (typ. at 20mA)
    A package of 18-gauge hookup wire to connect it all
    A couple of 1 watt resistors (half are 100-ohm and half are 1k-ohm)
    And my power supply is a 9V Battery

    I was thinking a 9V would be too much to power just 5 LEDs, but an LED Circuit calculator I used said it wouldn't be enough. That's why I wanted to come here and get your guy's opinion on the matter. The finished product should look something like this:
    [​IMG]

    Any help would be greatly appreciated. Thanks!
     
  2. Markd77

    Senior Member

    Sep 7, 2009
    2,803
    594
    Have you got the part numbers of the LEDs?
    It's definitely possible, but you might need some different resistors.
     
  3. #12

    Expert

    Nov 30, 2010
    16,252
    6,750
    Forget the part numbers. You already gave enough information.
    Put 2 yellows in series with 150 ohms.
    Repeat that.
    Put the big one in series with 165 ohms, at least 1/2 watt.
    Connect the three strings to the battery.
     
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  4. Iscaria

    Thread Starter New Member

    Sep 14, 2011
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    Okay that sounds good to me, but I have one question how would you connect multiple series to the same power supply? Sorry I'm kind of a noob =(
     
  5. #12

    Expert

    Nov 30, 2010
    16,252
    6,750
    You just made 3 series strings. Attach the end of one string to the positive of the battery. Attach the other end of that same string to the negative of the battery.
    Repeat this 2 more times.
     
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  6. Wendy

    Moderator

    Mar 24, 2008
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  7. Iscaria

    Thread Starter New Member

    Sep 14, 2011
    4
    0
    [​IMG]

    Voila! Took a lot of electrical tape, but I got it done lol. Thanks a lot for the help.
     
  8. #12

    Expert

    Nov 30, 2010
    16,252
    6,750
    Yay! That was about the smartest noob I've ever seen. Showed up with the right information and got it working in 3 questions.

    Hats off to Iscaria!
     
  9. Iscaria

    Thread Starter New Member

    Sep 14, 2011
    4
    0
    Lol thanks. Technically I'm not a noob cause I took Electronics in 8th grade and did way more complex stuff than this, but that was almost 10 years ago so I get a handicap lol. Now I just gotta work on building the actual cannon. I'll post pics of the finished product when I'm done.
     
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