Frustrated Modbus


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  1. #11
    Join Date
    Dec 2004
    Location
    nebraska
    Posts
    79


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    Default Re: Frustrated Modbus

    Hello,
    How is everyone? I got a new question, it is related to this project but not to modbus. If no one minds I am just going to keep asking questions on this post. I am working with a MCP4209 DA Converter. I want to output 0 to 10V. So I want to run the output of the 4209 into a non inverting 741 op amp. My problem is, the lowest value out of the op amp I can get is 3.97V. Is that all the closer a 741 can get to the lower rail. I have 12V going to the positive rail and ground hooked to lower rail. I get my 10V out when my 4209 is putting out 5V.
    I have a 10K resistor hooked from ground to pin2 of the 741. And a 10K resistor from pin2 of the 741 to pin6 of the 741. Input from the 4209 is running to pin3 of the 741.
    If I run the 741 at + and - 12V all works good but I do not want to add a negative voltage supply to my project. Is there anyway around this?
    Thanks
    Shawn
    Last edited by shawn; - 1st May 2011 at 19:46. Reason: lacking info

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