12v oscillator

Discussion in 'The Projects Forum' started by chopperdog, May 20, 2010.

  1. chopperdog

    Thread Starter New Member

    May 20, 2010
    10
    0
    Hello everyone.

    I could use a little help with a 12v oscillator, if that is the correct term.
    I think a 555 chip will work, but I don't understand how cycles correspond to seconds.

    Quite simply, what I am attempting to get is when 12v is applied via a switch, the timer will send out 12v for about 250 microseconds, then send no voltage out for 500 microseconds.

    I think a 555 calculator can accomplish this, but I don't really know how to use that.

    This is something that can be done quite cheaply I think, isn't it?

    Thanks for the help,

    Chopperdog
     
  2. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    Yes it can.

    Do you want the 250uS (high) and 500uS (low) to cycle continuously until the 12v is removed from the trigger?
     
  3. chopperdog

    Thread Starter New Member

    May 20, 2010
    10
    0
    Retched,
    Thanks for the reply.
    Yes, I want it to cycle continuously until the 12v power is removed.
    The 12v power will be applied with a momentary switch.

    Thanks,

    Chopperdog
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    How precise do you need the timing to be?

    A 555 timer is not very precise. If you need better than around 3% precision, you'll need to go to a crystal oscillator.
     
  5. chopperdog

    Thread Starter New Member

    May 20, 2010
    10
    0
    I would like pretty accurate timing, but it is not precision.
    Do you +/- 3% ? It that is the case, then the 555 would be fine.
    If you mean that a 555 timer is way off, then I shoud consider the crystal oscillator.
     
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