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Discussion in 'General Electronics Discussion' started by mechtronics, Sep 2, 2011.

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  1. mechtronics

    mechtronics

    153
    2
    Aug 7, 2011
    i have just wired up this and i am getting an output voltage of 2.17 volts without any frequency connected. i assume this is wrong as i connected another of the same chip and it was reading zero which should be right for no frequency input.??? i assume that the chip is faulty?? any1 know??
     

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  2. jackorocko

    jackorocko

    1,284
    1
    Apr 4, 2010
    I would assume the chips is bad too. Do you only have two of the same chips? Is there a test circuit in the datasheet that you could use to test the IC?
     
  3. mechtronics

    mechtronics

    153
    2
    Aug 7, 2011
    no i have 5 of the same chips 4 are reading zero and 1 is reading 2.17 volts i think one of them is faulty.
    when i connect a frequancy the 100 k should vary the output voltage for me.
     
    Last edited: Sep 2, 2011
  4. davenn

    davenn Moderator

    13,654
    1,888
    Sep 5, 2009
    have all 5 chips been tested in the same board ? that is... you are using an IC socket to be able to swap the chips for testing ?

    if so then pretty conclusive that the chip has been damaged... its VERY rare to have purchased a faulty chip.
    If the chips are all on separate boards then maybe you have made a wiring fault on the board with the faulty chip

    Dave
     
    Last edited: Sep 3, 2011
  5. mechtronics

    mechtronics

    153
    2
    Aug 7, 2011
    no all on the same board im using a bread board to test the circuit before i solder it permanently onto stripboard all the chips have been tested on the same board too. so i think it is a faulty chip myself?
     
  6. davenn

    davenn Moderator

    13,654
    1,888
    Sep 5, 2009
    yup sounds like it and as said in my previous post its VERY rare for it to be a manufacturing faulty device. More likely you damaged it with either static or incorrect placement into the board

    cheers
    Dave
     
  7. mechtronics

    mechtronics

    153
    2
    Aug 7, 2011
    ya i think i damaged it myself by accident!!!!
     
  8. davenn

    davenn Moderator

    13,654
    1,888
    Sep 5, 2009
    it happens, if you are going to be playing with electronics on a regular basis you should really buy an anti-static mat for your workbench and a the wrist strap that goes with it.
    Make sure the mat is grounded appropriately :)
    It will save you a lot of grief in the future, specially if you start playing with even more static sensitive IC's etc

    cheers
    Dave
     
  9. mechtronics

    mechtronics

    153
    2
    Aug 7, 2011
    ya i had that in mind for quite a long time now still havent got around to buying it!!!!
     
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