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10 led circuit help(white and red)

Discussion in 'LEDs and Optoelectronics' started by sage2605, Feb 17, 2013.

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  1. sage2605

    sage2605

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    Feb 9, 2013
    Hi.i have a project that has 35 leds (in all) a mix of 16 red-10 white-9 rbg (i have a seperate post for RBG)..so to start the leds are red-2.0-2.2v 20ma..white-3.2-3.4v 20ma..what is the best way to power this many at once without a huge power supply.thank you
     
  2. KJ6EAD

    KJ6EAD

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    Aug 13, 2011
    Last edited: Feb 19, 2013
  3. sage2605

    sage2605

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    Feb 9, 2013
    well some of the lights will not be on all the time. the white lights will come on when I flip a switch along with the others. what I have to make a different circuit to compensate for some of the lights not being on all of the time. reds and whites come on separately
     
  4. sage2605

    sage2605

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    Feb 9, 2013
    Can someone help me with rhe circuit.what resistors capacitors to use and such?
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Read the post by KJ6EAD above yours...
     
  6. ICGengineerTech

    ICGengineerTech

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    Aug 15, 2012
    Last edited: Feb 20, 2013
  7. sage2605

    sage2605

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    Feb 9, 2013
    Thank you .ive tried it and it says 12v isent enough for just 10 leds 3v 20ma. what am I doing doing wrong?
     
  8. ICGengineerTech

    ICGengineerTech

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    Aug 15, 2012
    I tried and...

    I gave it a try and put in your numbers:

    Source Voltage: 12
    Diode forward voltage: 3
    Diode forward current (mA): 20
    Number of LEDs in your array: 10

    What I got was a few options for arrays. I might not be understanding the whole problem here. Do you have to have each diode capable of turning on and off independently of each other?

    ~Bill
     
  9. duke37

    duke37

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    Jan 9, 2011
    With 3V/led, three leds = 9V To get 20mA and a voltage drop of the extra 3V, a series resistor R = V/I = 3/0.02 = 150 ohm. The three leds should be connected in series with the resistor.
    Three strings will allow nine leds and the current drain will be 3 * 20mA = 60mA

    You can work out the resistor if you want to add the odd led.
     
  10. sage2605

    sage2605

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    Feb 9, 2013
    all 10 white leds turn on together but I can cut that to 9 and just add the last one with its own resistor.the RGB leds (9) will all be on at the same time but different colors (no mixes,just basic RGB).The reds (16) will be on only when switched but all wil be on..thank you
     
  11. sage2605

    sage2605

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    Feb 9, 2013
    Thankyou
     
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