Connect with us

555 timer question

Discussion in 'General Electronics Discussion' started by Shadow1976, Dec 10, 2014.

Scroll to continue with content
  1. Shadow1976

    Shadow1976

    18
    1
    Dec 7, 2013
    Hi guys.
    It's been a while since I have used a 555 timer and this should be really easy for you all but I kind of forgot how to use one. Question I have is, in mono state, when you trigger the timer, will it stay in a state for the time that's set up regardless of if it is re triggered or will the time restart before timing out?
    Any info would be great.
     
  2. Bluejets

    Bluejets

    4,062
    848
    Oct 5, 2014
  3. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,268
    Nov 28, 2011
    The 555 does not restart its time period if another trigger pulse is received while a pulse is in progress.

    You need to ensure that the trigger pulse (low pulse on pin 2) is shorter than the monostable's period. If pin 2 is still low when the monostable delay expires, this will prevent the output from returning low (until pin 2 is returned high).
     
  4. Shadow1976

    Shadow1976

    18
    1
    Dec 7, 2013
    Thanks guys. I will play with one now.
     
  5. Circuit Basics

    Circuit Basics

    2
    0
    Apr 3, 2015
  6. Andy1989

    Andy1989

    1
    0
    Apr 3, 2015
    Thank you! I am looking for this too.
     
  7. Colin Mitchell

    Colin Mitchell

    1,417
    312
    Aug 31, 2014
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-