can i use a 3 terminal power supply to power opamp circuits(dual supply)?

Discussion in 'Homework Help' started by Santa klaus, Jul 11, 2015.

  1. Santa klaus

    Thread Starter New Member

    Nov 16, 2014
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    I have done projects in school mainly using power supplies with more than 6 terminals, so i know how to do a split supply on these PSUs,
    But now i want to invest in a 3 terminal power supply. Do i just connect each pin with the corresponding pin on the opamp? Don't we need two +/- supplies for dual supplies ? I'm confused
     
  2. panic mode

    Senior Member

    Oct 10, 2011
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    what to you mean by "3 terminal power supply" - you mean "3 terminal voltage regulator"?
    you can use two separate supplies and wire them as a dual supply (required that output is floating).
    you can also make dual supply and regulate both positive and negative rail using one positive and one negative regulator.
     
  3. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    If it is 3 terminal regulator you would need two regulators. One for positive (ex: 7812) and one for negative (ex: 7912).
     
  4. Santa klaus

    Thread Starter New Member

    Nov 16, 2014
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    thanks for ur replies .I mean a Power supply . with one positive rail, one negative rail and Ground. Do i need two positive rails, two negative rails to supply an opamp ? In other words , can i use an opamp in dual supply configuration with the first picture or do i need the second one? psu.JPG psu2.JPG
     
  5. Veracohr

    Well-Known Member

    Jan 3, 2011
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  6. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    To Power dual power supply OPAMPS u need this one PSU.jpg
     
  7. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    The green terminal is not ground. It is an Earth connection,
    I have the first one and I know
    To power opamps you cannot use the green terminal.
    You need to series connect the two PSU. That way you will get +ve, GND and -ve

    But you need to make sure that what you are buying have two isolated PSU's
     
  8. Santa klaus

    Thread Starter New Member

    Nov 16, 2014
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    To power opamps you cannot use the green terminal.
    You need to series connect the two PSU. That way you will get +ve, GND and -ve

    But you need to make sure that what you are buying have two isolated PSU's[/QUOTE]

    great thanks, That answered my question.
     
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