blinking LED project

Discussion in 'The Projects Forum' started by parissa_wall2, Nov 13, 2012.

  1. parissa_wall2

    Thread Starter New Member

    Nov 13, 2012
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    Hi, I have a simple project to make, but I don't know how. I have to make circuit with a simple LED for blinking at different frequencies. I have a signal generator connected to PNP 2N3906G transistor, the LED does not even turn on. anybody has any circuit schematic or can guide me, will be really appreciated.
     
  2. KJ6EAD

    Senior Member

    Apr 30, 2011
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  3. Wendy

    Moderator

    Mar 24, 2008
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    I was the author of that particular article, you will find folks will be glad to help design to what ever specifications you give, provided you are complete in your descriptions. The article shown is based around Radio Shack parts, there are many ways to skin this particular cat.
     
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  4. parissa_wall2

    Thread Starter New Member

    Nov 13, 2012
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    thanks for the link. Is there anyway I can do it with a transistor and a function generator? these are the only things I have right now, and this is just a project to help someone decide the speed of blinking.
     
  5. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    What is your power supply (or battery) voltage?
     
  6. parissa_wall2

    Thread Starter New Member

    Nov 13, 2012
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    I have bench power supply (5 v/10v)
     
  7. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    If your function generator has a 50 ohm output resistance, it can drive an LED directly.
    You can use a transistor, if you still want to.
     
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  8. parissa_wall2

    Thread Starter New Member

    Nov 13, 2012
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    Thanks Ron, the LED is on now, but not blinking, the function generator is set as Step, Amp 5v (Vpp) and frequecy 10Hz, DC offset at 0.
     
  9. parissa_wall2

    Thread Starter New Member

    Nov 13, 2012
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    Problem solved, I checked my cable from function generator and it was not 50 ohm cable, I changed it and it is blinking now. I appreciate your help.
     
  10. parissa_wall2

    Thread Starter New Member

    Nov 13, 2012
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    Now I have another question, how can I make an asymmetric flashing LED, I mean if I want the LED to be on for 1 second and off for like two seconds how can I make it?
     
  11. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    Your function generator should have a duty cycle or symmetry adjustment knob. What kind of function generator do you have?
     
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