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Summing Amplifier – Resistor at non-inverting input terminal

This signal conditional circuit outputs the sum of five 76Ohm output sensors in the 10mV range and the voltage gains are 10,15,20,25,30. Could someone please explain to me why do we need a resistor at the non-inverting terminal of the summer amplifier and why do we need an inverting amplifier connected to the summing amplifier? […]