The Input Impedance of this module is very high and is symmetric. This circuit can be used for strain gauges and for four wire measurements. If inputs are in mV use OP07. The merit is that it uses only 2 OpAmps yet has high differential Input Impedance.
Opamp Supply on Buffered Virtual Ground
The Outputs of Opamps are low impedance but still have limits
they cannot drive more than a few mA of Current into the Load.
If low ohmic value loads are to be applied use external
transistors as amplifiers. If inputs Vn-Vp are floating
Outputs may be random or Oscillating, it is good to have a
bias network of 10M resistors to a potential even zero or COM
this enables Vout when input floats.
Back to Analog Op-Amp Circuits
20th Mar 2020
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