Pwm circuit ?

Discussion in 'General Electronics Chat' started by curry87, Feb 3, 2011.

  1. curry87

    Thread Starter Member

    May 30, 2010
    101
    0
    Looking for a 555 pwm circuit that where you can change the duty from 0% to 100% via a pot without it affecting the frequency.Ive tried the usual 555 pwm circuit but frequency changes every time i change the duty.
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    Have you try this classic diagram
    [​IMG]
    When you can replace R1 and R2 with potentiometer

    Or this
    [​IMG]

    R1=R2<<P1
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
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