LED project

Discussion in 'The Projects Forum' started by stryke297, Jan 15, 2014.

  1. stryke297

    Thread Starter New Member

    Jan 15, 2014
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    Long-short. Need to power LED's from a wall outlet. Still in concept phase. I have a diagram that kind of visually depicts the project, but I don't have a wire/circuit diagram yet.

    My first issue/question is converting 120v AC to DC. I think I need a rectifier to convert to DC an some capacitors to smooth out the voltage. But I don't know how to incorporate a rectifier into a wire or circuit diagram, and not only do I not know which rectifier and capacitors I would need, I don't know how I would physically implement that. I'm assuming I would need a circuit board and any sort of power cord?


    [​IMG]
     
    Last edited: Jan 15, 2014
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    #1- Simply use a "wallwart" off the shelf AC/DC converter to get your DC. Like what you plug your cell phone into or any other device that requires DC from AC uses..
    #2- Discussions of "transformerless power supplies" are not allowed here for safety reasons..hence #1.

    So now with #1 you have "safe" DC available .. Now whats next in your project?
     
  3. KJ6EAD

    Senior Member

    Apr 30, 2011
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    I'm curious about the multiple voltages indicated. Are they intended to supply multiple colors or quantities of LEDs such as for an artististic or signage type display?
     
    Last edited: Oct 11, 2014
  4. stryke297

    Thread Starter New Member

    Jan 15, 2014
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    0
    Not allowed to make my transformerless power supply, got it.

    Doing a quick google search, most ac to dc converters have a car output. How do I get a - and + lead out of that?

    Since that takes care of power. The next step would be to incorporate the six LED channels, each having their own amp and voltage requirements, while being independently dimmable.


    The unique volt/amperage values for each channel do indicate different LED color and amounts. Off the top of my head I believe it goes:
    Ch 1; 3 blue "moonlight" 3w 20mm LED's
    Ch 2; 4 390nm 3w 20mm LED's
    Ch 3; 3 4000k 5w 20mm LED's
    Ch 4; 2 460nm 3w 20mm LED's
    Ch 5; 1 500nm 3w 20mm LED
    Ch 6; 1 690 nm 3w 20mm LED

    Not sure why the LED's in channel 3 are listed as 5w LED's. The spec sheet says they have a 3.25v max.
     
  5. KJ6EAD

    Senior Member

    Apr 30, 2011
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    Your specifications are rough and some of the colors listed are unusual but here's a source with lots of constant current dimmable supplies, both DC and AC powered.

    http://www.ledsupply.com/
     
  6. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Colors aren't unusually when you know they are building a LED fixture for I'd guess a "reef/saltwater" fish tank.

    Because its probably a 1.5A max LED and 1.5 x 3.25 = 4.875 (rounds to 5W)
    The others are probably 1000mA @3.0V (or something like that) = 3W

    and now that you edited your post to include more details trying to do a "wall wart" ain't gonna cut it.
    Here is how I would suggest doing it keeping it "easy"..
    I'll give you a starting point.. see if you can take it from there if you wish..
    Regular 24V enclosed AC/DC power supply.
    Use 1 meanwell LDD driver per channel.
    Those use a 5V PWM source for dimming. (555 timer maybe)
    or there are "off the shelf" multichannel LED controllers with LCD screens that can output a couple channels of PWM.. (like a Stormx,etc...)

    And I'd suggest against using any "high power" leds as moonlights.. Thats going to be way too strong and your tank will look like a Windex bottle shining bright.. Use regular 20mA leds/resistors/wallwart for the moonlights.
     
  7. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    And one more thing... If you want to learn all this go ahead with the project..
    BUT if you did this because you were scared off LED's based on the sky high prices charged for other units $600+ (maxspect/eco,etc..) Then check this out.
    http://www.oceanrevivellc.com/goods.php?id=18 (it was $159 last week and on ebay you can get them slightly cheaper some times)
    Its all done for you.. Has 2 channels that can be adjusted via a manual potentiometer and runs really cool. Quality so far is excellent.
     
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