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automatic college bell

Discussion in 'Project Doubts' started by amnamirza901, Sep 25, 2013.

  1. amnamirza901

    amnamirza901 New Member

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    kindly see this i made the same circuit and run this but display is blank what i dd wrog plz tell me
    udaychaitanya likes this.
  2. udaychaitanya

    udaychaitanya New Member

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    check connections with led.... hope so that is the problem in circuit... check once...

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