Question

1. In the figure above, Ra = 1k ohm, Rb = 2k ohm, Rc = 3k ohm. Rf = 12k ohm. The sources are va = -4V, vb = +2V, and vc = 1V. The power supplies for the op - amp are +15V and -15V. What is the value of vo? Notice that this op amp circuit might saturate, and you need to consider that possibility in your answer. Give your answer in volts and omit the units from your answer. 2. What must be R_a be changed to so that v_o is 13 V? Give your answer in kilo - ohms with no units.​

Answer 1

Answer:

€=€÷=€^34₩4₩6/6664/,_!/₩

Answer 2

Answer:

1)15

2)1.7

Explanation:

1) Since (-Rf/Ra)= -12,(-Rf/Rb) = 6,(Rf/Rc)= 4

Vout = (-4)*(-12) + 6 + 4 = 32

but saturates at +15/-15

so Vout = 15 volts

2) Previous 1) The Ra = 1.65 → 1.7