Need Help with Circuit design BAD!

Discussion in 'Homework Help' started by Jvietstylz, Dec 2, 2006.

  1. Jvietstylz

    Thread Starter New Member

    Dec 2, 2006
    2
    0
    I am an new engineering student and I cant figure out how to make a circuit with a blinking LED that stays on for ten second intervals. What I have so far is a circuit with two variable resistors, a resistor and an op amp. My led turns on and off already when I vary the resistor to cange the voltage accros them. How do I use capacitors and what calculations would I use to make it stay on for ten seconds.
    Please Help
     
  2. haditya

    Senior Member

    Jan 19, 2004
    220
    0
    ok what u need is a astable multivibrator.. its much easier to build using IC555 but since you dont have one no sweat, the same can be achieved using an opamp a few resistors and a capacitor
    are you familiar with schmitt triggers?
     
  3. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    145
    You may be best uploading a schematic of your circuit as a reference.

    Further to haditya's information, you may wish to look at Schmitt Triggers in the on-line textbook.

    Dave
     
  4. Johann

    Senior Member

    Nov 27, 2006
    190
    30
    Or you may try the well known, basic two transistor astable multivibrator (flip-flop).
     
  5. Jvietstylz

    Thread Starter New Member

    Dec 2, 2006
    2
    0
    Thanks for the Help,
    JImmy
     
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