555 of flip flop chip?

Discussion in 'General Electronics Chat' started by antennaboy, Apr 8, 2012.

  1. antennaboy

    Thread Starter Active Member

    Jan 31, 2008
    45
    0
    Hello forum.

    to make an LED blink, would I use a 555 chip or a flip flop and why?
    What is easier and why?

    thanks
    antennaboy
     
  2. jimkeith

    Active Member

    Oct 26, 2011
    539
    99
    A 555 is easier and has more drive capacity than a flip-flop.
    An astable flip-flop can do the same thing, but at less power.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    A 555 can sink and source 200ma, though it is recommended to hold that at 100ma.

    A CMOS circuit can sink or source 7ma max, more than that you run the risk of burning up the chip.
     
  4. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,172
    397
    A toggle FF requires an external clock; multivibrator [MV], built with transistors ,Rs & Cs will drive LEDs, lots of components & connections; MV using 74C914, schmitt trigger invertor will drive LED @ 10mA with Vdd 9V, or more output I by paralleling stages. Choice depends on what you have on hand & future plans- my vote is still 555, few components, output not as sensitive to Vdd, & cheap.
     
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