Flicker circuit

Discussion in 'General Electronics Chat' started by SonOfAnarchy ZA, Feb 27, 2013.

  1. SonOfAnarchy ZA

    Thread Starter Member

    Jul 13, 2011
    33
    0
    Hi guys id like to create a circuit that will control LEDs but the objective for the circuit will be when you turn on the LEDs they will flicker exactly like your florescent tube turning one, id like that kind of effect. Is this possible? im stumped :confused: cant figure a way to do it my knowledge is limited and am struggling to find a place to start and anyone direct me in the right direction please?
     
  2. ScottWang

    Moderator

    Aug 23, 2012
    4,852
    767
    You have to define more clearly or link a video, it will help us to know what you want.

    You may google "ne555 cd4017" to take a look do they match what you need?
     
  3. SonOfAnarchy ZA

    Thread Starter Member

    Jul 13, 2011
    33
    0
    Basically i got a strip of LEDs (12v) and id like to make them flicker like as if you putting on a florecent tube and it starts warming up i dont think a 4017 or 555 will do what i want.
     
    Last edited: Feb 27, 2013
  4. Brownout

    Well-Known Member

    Jan 10, 2012
    2,375
    998
    What do you think will?
     
  5. SonOfAnarchy ZA

    Thread Starter Member

    Jul 13, 2011
    33
    0
    oops sorry corrected:D
     
  6. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
    463
    Get a STM8 starter kit, it can be worked into such a circuit with LEDs.

    It has been done with analogue circuits, but does not look to good in many cases.

    There are not so many circuits (analogue) which can produce random oscillation at low frequency.

    One method is to mix two frequencies, with careful adjustment it can look like random, of course it is not. Still a lot of effort and occupies you for hours to do it properly.

    You don't have to learn all the C language and all STM8 possibilities, just to see how the demo program blinks LEDs, and add more LEDs, and modify it a bit.
     
  7. ScottWang

    Moderator

    Aug 23, 2012
    4,852
    767
    If you want a easier random flicker, no software, here are some ideas that may Interesting you:

    NE555 → 74LS90(74LS92,74LS93) → LED
    NE555 → 74LS90(74LS92,74LS93) → LED

    Connecting all the output to be a 4x4 LED dot matrix.

    If you want to increasing the brightness of LEDs, the you can do this way:

    NE555 → 74LS90(74LS92,74LS93) → CD4069 → PNP Driver → LED
    NE555 → 74LS90(74LS92,74LS93) → NPN Driver → LED

    Connecting all the output to be a 4x4 LED dot matrix.

    You can also using one CD4069 to replace two NE555 as this.
     
    Last edited: Feb 27, 2013
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