power supply for two op amps?

Discussion in 'Homework Help' started by caoadon, Jul 21, 2014.

  1. caoadon

    Thread Starter New Member

    Jul 11, 2014
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    0
    quick question.
    Can I power two op amps with the same power supply source?
     
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,377
    494
    Yes, you can.

    Also if you have a chip with two op amps build into it, they share power and ground so you only need two wires instead of four wires you would use with two chips that contain one op amp each.
     
  3. caoadon

    Thread Starter New Member

    Jul 11, 2014
    24
    0
    thank you sir!!

    edit: oh okay. Unfortunately i have two individual op amps so i gotta use 4 wires haha
     
  4. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,377
    494
    Nothing to be sorry about. It is part of learning. There is a Russian saying: measure 7 times, cut 1 time. Meaning do some planning before you start actually doing "stuff".

    On the other hand. Let us say that you need one op amp to work at 5 volts and second op amp to work at 10 volts. Then you would actually want two separate chips.

    Bottom line, and probably the most important point: you work with what you have in your hands! Which means that if you have two chips, you use two chips. Like I said above, nothing wrong with it.
     
  5. donpetru

    Active Member

    Nov 14, 2008
    186
    25
    Do not forget to bypass power rail with capacitors (0.1uF) for each operational amplifier.
     
  6. caoadon

    Thread Starter New Member

    Jul 11, 2014
    24
    0
    do i still need to bypass a unity gain op amp?
     
  7. donpetru

    Active Member

    Nov 14, 2008
    186
    25
    A capacitor near IC pin power "never hurts".
     
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