# ECE 300 Spring Semester, 2004 HW Set #4 ```ECE 300
Spring Semester, 2004
HW Set #4
February 17, 2004
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Name__________________
Print (last, first)
Use engineering paper. Work only on one side of the paper. Use this sheet as your cover sheet,
placed on top of your work and stapled in the top left-hand corner. Number the problems at the top
of the page, in the center of the sheet. Do neat work. Underline your answers. Show how you
got your equations. Be sure to show how you got your answers. Each problem counts 5 points.
(1). Find V0 in the op-am circuit of Figure 1. Ans. V0 = 2 V
2 k
50 k
+
1 mA
_+
V0
4V
I0
10 k 
_+
0.4 V
20 k 
_
Figure 1: Circuit for Extra 1.
Figure 2: Circuit for Extra 2.
(2) Find I0 in the op-amp circuit of Figure 2. Ans. I0 = 120 A
(3) Find IX in the op-amp circuit of Figure 3. Ans. V0 = 6 V, IX = -2 mA
1 k
IX
4 k
+
+
_
4V
2 k
3 k
VO
_
Figure 3: Circuit for Extra-3.
4.10
Superposition: IO = 2.4 mA
4.26
Source Transformation: VO = - 0.3 V
4.33
Thevenin: VO = 4.8 V
4.40
Thevenin: VO = 6.86 V
4.xx
Thevenin: Find the Thevenin equivalent circuit to the left of A-B in the circuit
below and then find IO in the output resistor. Ans: VTH = 8 V, RTH = 4 , IO = (1/3) A.

50 
50 
20 
+
_
20 V
8
1A
5
A
12 
IO
B

Figure 4.xx: Circuit for problem 4.xx.
4.50
Thevenin: VTH = 0 V, RTH = 1,000 
4.62
Norton: IO = 2 mA, RN = 1.33 k
4.65
Norton: RN = 2.12 k, IN = 5 mA, IO = 2.57 mA
4.69
Using Thevenin: VOS = VTH = 24 V, RTH = 4 k, VAB = 20 V
4FE-1 Maximum Power Transfer: RL = 2 k for maximum power transfer, PL,max = 8 mW
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