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555 timer with 50% duty cycle question

Discussion in 'Electronic Design' started by panfilero, Dec 27, 2006.

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  1. panfilero

    panfilero Guest

    Hi, does anyone know how I could get a 555 timer to operate in astable
    mode at a 50% duty cycle? All the circuits I've seen are always for
    greater than 50%. thanks.
     
  2. Jim Thompson

    Jim Thompson Guest

    It's easy with the CMOS version of the 555 timer...

    Tie Threshold and Trigger together, capacitor to ground from this
    node, likewise a resistor to output... voila, 50%.

    ...Jim Thompson
     
  3. John B

    John B Guest

    Yes. Go here:

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

    and download the data sheet. Look at page 10 (figure 14). IT shows you
    exactly how to do it.

    GIYF.
     
  4. You go to sci.electronics.basics where this sort of question belongs,
    and you look for the answers to your post asking the very same thing
    there.

    Michael
     
  5. Guest

    While there are ways to get close with feedback, one can get closer
    with
    a flip/flop set to toggle. With two flip/flops, you can get four
    phases of
    quadrature output. The '555 has to run at 2 or 4 times the desired
    output
    frequency, though.
     
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