Hi
i am trying to measure voltage from a transducer (rep as JR1). it usually has a high impedance of 20mohms or about. When triggered its impedance will drop to 68k.
I have chosen R1 as 68k so voltage will climb from 0 to 2.5V.(neglecting bias current , offset voltage etc).
Now i want to use another transducer whose value drops from the same (20-30)Mohms to 6Mohms.
So incase i choose R1 as 6.8Mohms will LM358 work or do i need to look for a new opamp.
Or
can i measure the value across R1 directly using a microcontroller eliminating the voltage follower ??
Thanks in advance.