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555 Timer PWM - Adjusting Duty Cycle without Changing Frequency

Discussion in 'General Electronics Discussion' started by ahchah08, Jun 18, 2013.

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  1. ahchah08


    Jun 18, 2013
    I am wondering how to do this. I've been researching tons of articles and different circuits for the past few days, but none of them have done what I want.

    A lot of the circuits I looked at would only allow minimum duty cycle changes without affecting the frequency. The closest thing I could find is here :

    I am trying to ultimately achieve a circuit that would change duty cycle from 1% to 99% while keeping the frequency at 200Hz. I would keep it in a box and control using a pot or rotary switch.
  2. ahchah08


    Jun 18, 2013
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
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