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opamp voltage converter question

Discussion in 'Electronic Basics' started by Tom Del Rosso, Mar 28, 2013.

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  1. A simple level converter. It assumes the +4V supply can sink current, so
    why not just have 2 resistors between +4 and +10 and use the opamp as a
    buffer?


    +10V
    |
    |
    R
    |
    |
    |----------
    | |
    | |
    R |
    | |
    | |
    GND |
    |
    |
    |---- +
    +4V -----R------------- - |
    | |
    | |
    |------2R-----|
     
  2. I know what you mean. This was just someone's idea of an example but he
    should have thought of a better one. I wondered if there was any
    justification for using 4 resistors.
     
  3. Yes, I know you can't get gain with passive components. :)

    I wasn't suggesting resistors with no opamp. I just wanted to know if the
    4-resistor approach had any advantage over the obvious 2-resistor
    equivalent.

    In the OP I said 'use the opamp as a buffer', so do you mean that it would
    have no gain (unity gain) with that approach?
     
  4. It was somebody's example of a 'basic opamp circuit' so I wondered if there
    was any reason to do that other than making an imaginary circuit.
     
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