"John Fields" wrote in message
...
On Sun, 13 Nov 2011 19:44:25 -0500, "Martin Riddle"
wrote:
"John Fields" wrote in message
news
Better.
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JF
What if Ra and Rb were 20k?
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I don't understand your question.
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JF
Oh sorry the inverting amp threw me.
You should have your drawings checked
Cheers