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what's the part number of the chip?

Discussion in 'Datasheets, Manuals and Component Identification' started by Haibo, Jan 2, 2016.

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  1. Haibo

    Haibo

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    Jan 2, 2016
    Hi,I try to repair my instrument, but I don't know the part number of the device U1 in the figure,could you help me? thanks. Circuit.JPG
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Do you have a picture of the chip in question?
     
    Haibo likes this.
  3. Haibo

    Haibo

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    Jan 2, 2016
    Hi,Steve
    I'm sorry I can't give you the picture because the device is badly damaged, the only thing i know is that it is an 8-pin chip and the pin-6 output square wave whose frequency is 9.08Hz.
    thank you.
     
  4. Martaine2005

    Martaine2005

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    May 12, 2015
    Hi Haibo,
    What instrument is it?
    Looks like an oscillator input to pins 2 and 3 with pin 6 outputting the frequency.
    Some kind of multivibrator circuit?
    Possibly an op-amp of some kind..

    Martin
     
  5. duke37

    duke37

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    Jan 9, 2011
    The device looks like an oscillator controlled by a 4MHz crystal (very common).
    To get an output of 9.08Hz, you need a division of something over 440 528, not common and a lot in a little chip.
     
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  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    There are a number of mask programmable divider chips. One that I'm aware of takes the 3.something MHz colour burst crystal and gives you (from memory) 50Hz. (The datasheet says 60Hz)
     
  7. davenn

    davenn Moderator

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    Sep 5, 2009
    yup, and also a number of RF prescaler IC's that do this sort of thing eg. a MC12074 < --- just an example type different versions have different divide by rates


    I have no idea what that chip in the above cct is ??
     
  8. GPG

    GPG

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    Sep 18, 2015
    Got more of the cct?
     
  9. Colin Mitchell

    Colin Mitchell

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    Aug 31, 2014
    You could use a PIC chip and create the output yourself.
     
    hevans1944 likes this.
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