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You could always add a - DC input to a 4'th input to summer, and use that V
to level shift the ouput so that it is in + range on ouput of OpAmp. Then
in processor simply subtract thaut out oif reading. And in processor math
handle the sign inversion problem because of inverting summer behavior.

Just a thought, save an OpAmp.

[QUOTE="danadakk, post: 1790277, member: 604253"] You could always add a - DC input to a 4'th input to summer, and use that V to level shift the ouput so that it is in + range on ouput of OpAmp. Then in processor simply subtract thaut out oif reading. And in processor math handle the sign inversion problem because of inverting summer behavior. Just a thought, save an OpAmp. [/QUOTE]

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