Output of 555 monostable stays on

Discussion in 'General Electronics Chat' started by Bluefire2, Mar 29, 2013.

  1. Bluefire2

    Thread Starter New Member

    Mar 29, 2013
    I'm making a monostable using a 555 timer IC, and when I press a button to make my trigger go low, pin 3 comes on but stays on and doesn't come off. As I said, I have made sure that my input to pin 2 is normally high and goes low when the button is pressed (and goes high again when it is released); are there any other potential causes of this happening? My resistor and capacitor values are way too small for this to be due to the normal operation of the monostable.

    I'm using a 9v power supply on a breadboard, if that helps at all.
  2. crutschow


    Mar 14, 2008
    Post your circuit diagram.
  3. tracecom

    AAC Fanatic!

    Apr 16, 2010
    A schematic is best, but at least post the values of R1 C1.