Summation circuit for the linear displacement sensors. [The sensors measure how much the rock length changes under applied load.] Two voltages in, one averaged voltage out.
Inputs here were 2.388 V and 2.068 V. Not bad for a cheap op-amp.
H. Sone, being a smart-ass:
"It's not working right. Why isn't it perfect?"
Pesky reality, being all nonlinear.
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