Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Electronic Timer Circuit

  1. Mar 3, 2015 #1

    I would like to design a simple electronic timer circuit by other NE555 IC or BC548 Transistor. I’ve got a circuit but it doesn’t work. Would you please me in this regard?

    Appreciate, if you would get back to me with tested circuit diagram at your best possible time.


  2. jcsd
  3. Mar 3, 2015 #2


    User Avatar

    Staff: Mentor

    Can you post your schematic and a picture of your breadboard?
  4. Mar 3, 2015 #3
    you'll need at least 2 transistors to get a waveform, I don't think it can be done with one transistor and you said timer (aka counter), you can't make that with the parts your describing.
  5. Mar 4, 2015 #4

    jim hardy

    User Avatar
    Science Advisor
    Gold Member


    NE555 is the ubiquitous Signetics timer IC ,


    Plenty of information here to help you figure out why your circuit doesn't work.
    http://my.ece.ucsb.edu/York/Bobsclass/2C/Tutorials/App notes/555an.pdf

    as Berkeman said, post a drawing of what you tried...
  6. Mar 4, 2015 #5
    the 555 produces pulses or waveforms, my mistake I saw the word timer and thought of counter. don't mind me I'm stupid today :wideeyed:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook