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    leds in home

    I was wondering if anyone knew of any leds to use for home. Im looking to get uv ones for a table.

    The ones from oznium would work right?
    You just have to wire them in series to get 120v right?



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    Re: leds in home

    No different than wiring them for a car...except you'd probably need a wall-wart power supply as they aren't designed for AC.




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    Re: leds in home

    Really?

    How bout any of these?
    Or is it the same thing...

    http://www.superbrightleds.com/leds.htm



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    Re: leds in home

    You would probably need to do this as a bare bones solution to making it work.

    You insert a generic diode like 1N4003 and place it in series with the LED because
    the LED reverse voltage is only rated for 5V. These 1N4003 are rated for 200V.

    AC input -> 1N4003 -> LED -> resistor

    Diagram 1
    http://library.thinkquest.org/16497/.../led-diode.gif

    The diode and LED have a polarity and notice how they have it wired.
    Diode cathode to LED anode.

    Replace the 3V battery in the circuit with 120v AC.

    Last, recalculate the new resistor value for the increased voltage.

    AC volts peak = 120v rms x 1.414 = ~ 170.

    Figure out what the nominal LED current is to safely operate it. Lets use
    0.02 amps.

    The shortcut math that is 99% accurate is;

    170v / 0.02 A = 8500 Ohm resistor.

    Replace that 470 Ohm resistor in that drawing with one that is 8500 Ohm,
    but this resistance value is not common so you can round up to 10,000 Ohm.

    Since the AC mains are alternating, the LED will be turning off/on many times
    per second. It may be doing this so fast that you may not notice it.

    Diode specs;
    http://www.fairchildsemi.com/ds/1N/1N4001.pdf

    If you want to make a better circuit, there is more ways. This is the bare bones
    method.

    If you have more than one LED then you insert them in series and because there is
    a small voltage drop across each LED and diode, eventually you will have to redo the math
    to get an appropriate resistor so you don't get severe dimming.




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    Re: leds in home

    Hmmm

    So i need a diode for each led?



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    Re: leds in home

    if you scoop one of these
    http://www.allelectronics.com/matrix...nsformers.html

    6 Vdc 1.5 amp 2.5mm co-ax positive C DCTX-615 4.25 3.25

    you can hook 2 led's together [in series iirc?] each time for 3v each, and then wire each group of 2 leds in parallel off the power transformer (lop the end off) and since your LED's pull just about 20ma each - you can hook just around 75 of them to each transformer

    that way you dont need any resistors, and they are well under their 3~3.5v limit. throw a potentiometer on there and you got yourself a dimming switch!

    and then just run them whereever ya want. get a little toggle switch to put inline on the - wire and your all set.

    hope that helps.


    also

    http://www.lsdiodes.com has the BEST leds on the planet. period.
    Last edited by req; 12-19-2005 at 02:02 AM.




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    Re: leds in home

    Awesome.


    I think thats what I will do.

    Just gotta work on my soldering skills now.



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    Re: leds in home

    Quote Originally Posted by btnhfan
    Hmmm

    So i need a diode for each led?
    You only need one diode per loop. If you have 1 LED or 100 in series, one diode
    is fine. The real question is.. Why do you need to operate the LED's from a 120 volt AC source? The AC/DC adapter method is more politically correct.




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    Re: leds in home

    Yea thats what Im doing now.

    Realized that.



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    Re: leds in home

    yay!

    i win thylantyr!!!

    i beat you! MAUAHHAHAH!!!




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