positive edge trigger timer

Discussion in 'General Electronics Chat' started by diwa2000@gmail.com, Jun 26, 2008.

  1. diwa2000@gmail.com

    Thread Starter Active Member

    Apr 15, 2008
    40
    0
    Hello
    Is there any positive edge trigger....like the negative edge triggered trigger 555 timer.
    Please help
    Thanks
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    When you invert your trigger signal, a negative trigger becomes a positive trigger.

    Greetings,
    Bertus
     
  3. Sparky

    AAC Fanatic!

    Aug 1, 2005
    75
    0
    I'm not sure the end use and how you are using the 555.

    The Fairchild MM74HC4538N has within its truth table a positve edge and negative edge input option.
    The MM74HC4538 is a 1-shot with output pulse = 0.7(RC)
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    You can use a not gate or a simple transistor to invert your signal.
     
Loading...