Adding voltage to a circuit

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  1. - 28th May 2008, 19:47 #13
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    Tobias
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    Here is what I have and it seems to work great in the simulation software. I am now bench testing and have a few questions. I can add voltage into the circuit on the bench yet it seems very noisy. For example Pot1 is outputting average 1.33v with a VPP of 240mv. The output of Op-Amp1 is average 1.48v with a VPP of 1.12v.

    I am using an AD5220 10k digital pot and a L272M Op-Amp. Here is a link to the basic info regarding the Op-Amp.

    http://search.digikey.com/scripts/Dk...=497-1387-5-ND

    This is my first attempt using Op-Amps. There seems to be a hell of alot of variations to choose from. What would cause the noise? If I am off on the correct Op-Amp, please suggest a replacement. Thanks
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