Comprehensive Problems
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Comprehensive Problems
2.76 Repeat Prob. 2.75 for the eight-way divider shown in Fig. 2.136.
Figure 2.136 For Prob. 2.76.
2.77 Suppose your circuit laboratory has the following standard commercially available resistors in large quantities:
1.8 Ω 20 Ω 300 Ω 24 kΩ 56 kΩ
Using series and parallel combinations and a minimum number of available resistors, how would you obtain the following resistances for an electronic circuit design?
| (a) 5 Ω | (b) 311.8 Ω |
|---|---|
| (c) 40 kΩ | (d) 52.32 kΩ |
2.78 In the circuit in Fig. 2.137, the wiper divides the potentiometer resistance between αR and (1 − α)R, 0 ≤ α ≤1.Find vo / vs.
2.79 An electric pencil sharpener rated 240 mW, 6 V is connected to a 9-V battery as shown in Fig. 2.138. Calculate the value of the series-dropping resistor Rx needed to power the sharpener.
2.80 A loudspeaker is connected to an amplifier as shown in Fig. 2.139. If a 10-Ω loudspeaker draws the maximum power of 12 W from the amplifier, determine the maximum power a 4-Ω loudspeaker will draw.
For Prob. 2.80.
2.81 For a specific application, the circuit shown in Fig. 2.140 was designed so that IL = 83.33 mA and that Rin = 5 kΩ. What are the values of R1 and R2?
- 2.82 The pin diagram of a resistance array is shown in Fig. 2.141. Find the equivalent resistance between the following:
- (a) 1 and 2
- (b) 1 and 3
- (c) 1 and 4
2.83 Two delicate devices are rated as shown in Fig. 2.142. Find the values of the resistors R1 and R2 needed to power the devices using a 36-V battery.
Figure 2.141
For Prob. 2.82.
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