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Triangular Wave Guidance

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by blah2222, Aug 9, 2011.

  1. LarsNor

    LarsNor New Member

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    I figured out my circuit in PSpice, but i faced with problem. It work with 1Khz, but i need 10 Khz and i can't to adjust it because i'm loosing signal. Who knows how to adjust it?

    When i reduce C2 or R4 more i have the last one picture
     

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  2. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    541
    Location:
    AZ 86334
    One problem is that you are using 741s. Look up the Gain vs frequency of that old, obsolete, crappy opamp.

    Another problem is that you are using only +-5V supplies (were it just barely begins to work), and a 741 is not even close to being rail-to-rail output, which you need for the peaks of the triangle wave to reach close to the + and - voltage rails.

    Try a modern rail-to-rail cmos opamp!
     
  3. LarsNor

    LarsNor New Member

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    What can you advice for 5 volts? i tried few but it didn't work
     
  4. dave

    Dave New Member

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  5. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    541
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    This one is rail-to-rail, is fast enough, and runs on 5V. I'm showing how to run it on a single 5V supply. Note the rise and fall times on V(y). Note the frequency it is running at.

    Vib.png

    Go and re-read Crutschow's post (#69)

    Any of these I found at Digikey would work (DIP, rail-to-rail, low-voltage, fast slew rate).
     
    Last edited: Apr 9, 2017

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