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555 Timer

Discussion in 'Electronic Basics' started by smokie, May 31, 2005.

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  1. smokie

    smokie Guest

    What happens to the output voltage when the 555 timer supplies higher
    current? how good is the program multisim? Would it be worth the
    investment?
     
  2. Bob Monsen

    Bob Monsen Guest

    My guess is that the only effect that drawing more current from the
    output of a 555 will have is that it'll heat it up. However, the timing
    will probably not be affected; the timing is based on a comparison
    between a three-way internal resistive divider, and the trigger and
    threshold inputs. That won't change much when the thing heats up.

    As to the simulator, I'd try LTSpice first, from www.linear.com. It's free.
     
  3. Rich Webb

    Rich Webb Guest

    The output voltage droops (Vcc - Vout gets larger).
     
  4. Chris

    Chris Guest

    Hi, smokie. As current sourced or sunk through the output transistors
    of the 555 increases, more voltage is dropped across those transistors.
    Look at page 5 of the datasheet for graphs of output voltage vs.
    output current:

    http://www.national.com/pf/LM/LM555.html#Datasheet

    It's usually a good idea to look at the datasheet.

    Newbies in electronics need some background and basic knowledge before
    they can make good use of simulation programs. You might be better off
    downloading LTSpice as mentioned in another post, then taking the money
    and enrolling in a summer course at the local junior college.

    Good luck
    Chris
     
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