Assignment

1. The circuit shown uses a 9.0V zener diode. If the load resistance RL is equal to 1.5 kΩ, and the DC source equals 24V, find the maximum value of resistor RS required to maintain a constant voltage of 9V across the load.            [Ans:RS =2.5 KΩ ]

   

   Figure 5

2. Determine the range of (V_S) for obtaining a regulated voltage shown in Fig.6 for the data 0≤(I_L)≤4mA 2≤IZ≤8mA [Where Z=50V,(R_S)=5KΩ]            [Ans:The range of source voltage is 50 ≤ (V_S) ≤ 110 V]

Figure 6

3. Determine the R_Lmin, where R_S=1KΩ ,Vin=50V, V_Z=10V

            [Ans:R_Lmin=300Ω ]

Figure 7

4. Determine the I_L and I_Z, where R_S=160KΩ ,V_in=24V, V_Z=12V, 200≤R_L≤∞             [Ans: 0 ≤ I_L ≤ 60 mA & 75 ≥ I_Z ≥ 15mA]

Figure 8

5. Determine the I_S and I_Z,where R_S=5KΩ , V_Z=50V, R_L=10KΩ 80≤V_S≤120             [Ans: 6mA ≤ I_S ≤ 14 mA & 1mA ≥ I_Z ≥ 9mA]

Figure 9