LED WigWag

Discussion in 'The Projects Forum' started by acidtrace, May 27, 2010.

  1. acidtrace

    Thread Starter New Member

    May 27, 2010
    1
    0
    Hello, I was wondering if someone could look at my circuit

    One question i have is.

    The 4 Blue LED's I'm wanting to use are 3.17v 20ma
    just want to make sure i don't blow them with too much current.

    Circuit Current Version
    11.0V 17 ma to the LED's
     
  2. Markd77

    Senior Member

    Sep 7, 2009
    2,803
    594
    Yup, those are going to burn. A couple of 330 ohm resistors should fix it.
     
    acidtrace likes this.
  3. BMorse

    Senior Member

    Sep 26, 2009
    2,675
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    wouldn't it be more appropriate to use 470 to 680 instead of 330 at 11V.?

    B. Morse
     
  4. Markd77

    Senior Member

    Sep 7, 2009
    2,803
    594
    I just used this:
    http://led.linear1.org/led.wiz
    with 11V and 17ma and Vf of 3.17 that's what I get.
    470 or 680 would give a safety margin, but LEDs would be dimmer.
     
  5. Wendy

    Moderator

    Mar 24, 2008
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