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    anonymous_27's Avatar
    anonymous_27 Posts: 1, Reputation: 1
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    #1

    May 3, 2014, 09:30 PM
    555 ic can operate only give +Vcc but op-amp required +Ve and -Ve both why??
    555 timer ic can operate only giving up by +Vcc supply but op-amps(741) ic reqiure both +vcc and -Vcc why??
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
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    #2

    May 4, 2014, 05:38 AM
    Maybe you should ask your teacher. And that's my final answer.
    hfcarson's Avatar
    hfcarson Posts: 1,003, Reputation: 49
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    #3

    May 5, 2014, 07:20 AM
    This is like asking "why doesn't anything work when only +V connected"...
    and review the definition of "circuit"...
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #4

    May 6, 2014, 10:19 AM
    Your first problem is that you have to an "Electrical Forum" for assistance on an "Electronic" issue. Two very different animals.

    I don't have any specs on the IC you are trying to debug. Is this a question from a test or are you trying to debug an actual chip.

    Did you verify the voltage levels with a meter, logic probe or scope?
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #5

    May 6, 2014, 10:25 AM
    Just for the record, the 555 timer is a "Non Inverting" which means +V, while the 741 is "Non Inverting and Inverting" chip.

    These two chips have nothing in common and perform completely different functions.
    smoothy's Avatar
    smoothy Posts: 25,492, Reputation: 2853
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    #6

    May 6, 2014, 10:26 AM
    THis id definitely a homework question... I'd suggest looking up the specs for the 555 timer chip and looking up those for an Op amp.

    THis is really self explanitory.

    Except the part about "giving up", which makes no sense at all in the context of the question. Like it was a misunderstanding or bad translation of the original question.
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