In the circuit shown, supply voltage = ±15v, Va= +3v , Vb= -4v , Vc= +5v, R= R1= 1kΩ and RF= 2kΩ. 741 op-amp has A= 2×105 and R1= 10kΩ. Determine the output voltage internal resistance of the circuit?

In the circuit shown, supply voltage = ±15v, Va= +3v , Vb= -4v , Vc= +5v, R= R1= 1kΩ and RF= 2kΩ. 741 op-amp has A= 2×105 and R1= 10kΩ. Determine the output voltage internal resistance of the circuit? Correct Answer Vo ≅3v , RiF=6.67MΩ

The output voltage Vo= × = ×= 2.67 ≅ 3v. Internal resistance of circuit, RiF =R i = 100Ω× => RiF= 6.67 MΩ.
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