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OpAmp - easy question

Discussion in 'Misc Electronics' started by Mark Haase, May 29, 2004.

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  1. Mark Haase

    Mark Haase Guest

    Hey--

    9V is a weird voltage in a lot of projects. We used OpAmps in an
    entry-level EE course where we had access to bench power supplies and
    could dial in 9V.

    Now I'm working at home, and the project that I am designing will have
    an AC adapter which will provide 12V and 5V to the board. I'm wondering,
    can I provide the OpAmp (probably an LM7414) with 9V by using a simple
    voltage divider circuit? Or does the OpAmp have an internal resistance
    thats significant, and if so, is it constant or variable?

    Thanks in advance
     
  2. Jim Thompson

    Jim Thompson Guest

    Most OpAmps are (nearly) constant current, as far as quiescent current
    is concerned. I'd just use the +12V supply for the OpAmps.

    ...Jim Thompson
     
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