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    How to use a flip flop in 4 LED random flasher project

    i am just a beginer wid the circuit,working on a small project.its a random flasher in which only 1 LED is ON at a time. i want to use a clock circuit using D flip flop.suppose I need to use 4 LEDs,m not gettin how to use flip flop?

    •   Alt28th November 2010, 08:14

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    Re: How to use a flip flop in 4 LED random flasher project

    u can made also by using 555 timer ic and decade counter



    •   Alt28th November 2010, 16:10

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    Re: How to use a flip flop in 4 LED random flasher project

    u also can use CMOS counter IC..try search for CMOS 4000 series..it easy..dont afraid with the name..
    it just 1 or 0
    lockman_akim



    •   Alt28th November 2010, 16:14

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    Re: How to use a flip flop in 4 LED random flasher project

    Maybe something like the ring counter shown in this: 4015 dual 4-stage shift register. You run the ring counter at a high enough clock speed to make it seem random when it's stopped by a button push. If you need to conitinuously display random LEDs, try a variation of the pseudo-random method in the same link.
    Last edited by KJ6EAD; 29th November 2010 at 08:46.



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    Re: How to use a flip flop in 4 LED random flasher project

    Quote Originally Posted by sunny1986 View Post
    u can made also by using 555 timer ic and decade counter
    thnx ,its help ful :)



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    Re: How to use a flip flop in 4 LED random flasher project

    Actually, a really cheap, poorly made, pushbutton connected directly to the clock input of a decade counter can also produce a random count. No need for a 555 timer or other clock circuitry. One case where switch bounce is a good thing! Then a BCD to decimal decoder can be used to drive only one LED at a time. This would work for up to 10 LEDs if all bits were used; if the upper two bits to the decoder where pulled low, then one of four - as per the original post - would light. I've used this technique in the past...



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    Re: How to use a flip flop in 4 LED random flasher project

    The OP has clearly stated an intent to use D-type flip flops.



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