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Summing non inverting op amp.

Discussion in 'Misc Electronics' started by daveatfernie, Jun 27, 2006.

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  1. daveatfernie

    daveatfernie Guest

    I've a voltage change 3-4 Volts which I need to change into a 0 to 4
    Volt signal.
    I have used an inverting op-amp with a virtual ground to give a
    cracking result but unfortunately the voltage is going the wrong way
    (decreasing instead of increasing.

    I have changed to circuit over to be a non inverting amplifier but I'm
    worried about the virtual ground. I've been told that summing in a non
    inverting op amp can be difficult.
    I took the series resistors out of the circuit from my virtual ground
    (created from a pot) and from the voltage that I'm amplifying. I have
    a 560K feedback and 220K to ground giving me a gain of around 3.5.

    Will I have problems with the virtual ground being amplified to or any
    other problems?

    Many thanks in advance.

  2. daveatfernie

    daveatfernie Guest

    If I was to conect my ground resistor to my virtual ground would this
    be a better circuit. I'm now worried that my offset voltage from the
    virtual ground will also be amplified by the op amp.

    Cheers again

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