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Re: Op amp mixer circuits - to invert or not to invert


 

Filter circuits do not always non-invert. There is a trick to use an opamp in an inverting mode if only a positive voltage is available. The method involves establishing a reference voltage that is 1/2 of the rail voltage as a virtual circuit return. Then work off that level as if it is the circuit zero-level. Then reference back to proper circuit return. I have performed this trick several times. Key is to have a good reference to work with.

DerekK

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