control of ne555

Discussion in 'The Projects Forum' started by iodahoboy, Mar 10, 2010.

  1. iodahoboy

    Thread Starter New Member

    Mar 9, 2010
    can i make a ne555 reduce current and be a timer
    i need to go from 12v dc to 4 v dc and one minute on one minute off constant rotation on the timer
    i sure thank you guys for any help
    jack :D
  2. Wendy


    Mar 24, 2008
    Try defining that a little tighter. What kind of timer?

    A CMOS 555 (which comes in many flavors from several companies) operates from 2V - 18V. Is this what you mean?
  3. retched

    AAC Fanatic!

    Dec 5, 2009
    I think the OP wants to reduce his voltage from a 12v input to 4v and then have a timer high(4v) for one min then low(0v) for one min looping.

    I think he is hoping the ne555 is a VOLTAGE regulator opposed to a CURRENT reducer and a timer all in one.

    At least that is what I got out of the post.

    Is this correct?

    If so, The ne555 can do the on, off timer part, but you will require additional components for the voltage reduction.

    You could use a 7805 to go from 12v to 5v then a diode to drop to ~4v.

    I should ask, What do you want to turn on and off? That will define current requirements.
    Last edited: Mar 10, 2010