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    Problem with Converting voltage to frequency !

    Hi all . I have a problem with Lm331. I connect Fout pin in Lm331 to B pin 2n2222 transistor. And i really want to know transistor 2N2222 can work on off with frequency about 1kHz. Because i want to measure voltage Dc by counting frequency use Microcontroller 8051! Thank !

    •   Alt29th January 2010, 13:29

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    FvM
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    Problem with Converting voltage to frequency !

    It surely can. But there's no reason to use a transistor in this place. Just connect Fout to the 8051, with a pull-up resistor as suggested in the datasheet.



    •   Alt29th January 2010, 14:20

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    Re: Problem with Converting voltage to frequency !

    XR4151 is Voltage to frequency and frequency to voltage converter IC u can use this ic 4 yr work



    •   Alt29th January 2010, 14:44

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  4. #4
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    Problem with Converting voltage to frequency !

    LM331 is similar with them, hase both functionality too...
    K.

    Added after 2 hours 23 minutes:

    HI,
    Tnx & check LM331 datasheet from National-is more detailed & has some ciruits-ideas too.
    K.


    1 members found this post helpful.

  5. #5
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    Re: Problem with Converting voltage to frequency !

    hi1
    i have a circrit with lm331&89s52 as file:

    http://www.mediafire.com/?myczt5dom2w
    http://www.mediafire.com/?myczt5dom2w

    please check for me!
    thanks!



    •   Alt30th January 2010, 02:16

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  6. #6
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    Problem with Converting voltage to frequency !

    Hi dryvu,
    Sorry, me isnt possible to download your file!
    Firefox,Opera & IntExplorer, all 3 are not enough to get it...
    Pls send it me as PM & attached file or put it public on...
    K.



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