vi of 37 
 i ii iii iv v vi 1 2 3 4 5  
 

Note. R5 and R6 are identical if you desire VCC equal to VEE
If not choose R5 and R6 to give zero volts at their junction

 

OP07 used for illustration. Any precision low drift OP AMP will work

 

DUAL TRACKING SYSTEM
Fig 3
 
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