Can i use digipot for adjusting frequency of ramp waveform generated using 555timer

Discussion in 'Programmer's Corner' started by krishnan158, Feb 9, 2014.

  1. krishnan158

    Thread Starter New Member

    Jan 11, 2014
    3
    0
    My problem is i have to generate ramp and square waveforms with different frequencies. I planned to adjust frequency using digital potentiometer.can i use digital potentiometer to adjust frequency of waveform generated. I have tried on simulation but i cant get any response.:):):)

    thank you
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Do you want equal slopes on the charge and discharge part of the timing cycle. If so, use an opamp integrator instead of a 555.
     
  3. krishnan158

    Thread Starter New Member

    Jan 11, 2014
    3
    0
    my ramp is terminated ramp. i want to know can i use digipot insted of potentiometer in ramp generated. the potentiometer will control current using transistor557 to generate the terminted ramp
     
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