Be the circuit shown in the Figure 64-02.1. Assume that Vi = 20 volts, V_Z = 10 volts and the current in the load ranges from 30 to 90 mA. Verify that zener 1N758 that can dissipate up to 0.5 W of power can be used in the design.

Problem 64-3    Source:   Problem elaborated by the author of the site.

Be the circuit shown in the Figure 64-03.1. Assume that Vi = 27 volts with ΔV = 4 volts and V_Z = 15 volts. The current consumed by the load is 100 mA. Determine the values of R_Smax and R_Smin and what the power in the zener.

Problem 64-4    Source:   Problem elaborated by the author of the site.

Be the circuit shown in the Figure 64-04.1. Assume that Vi = 24 volts with ΔV = 6 volts and V_Z = 12 volts. The current consumed by the load varies from 30 mA to 100 mA. Determine the values of R_Smax and R_Smin and what the power in the zener.

Problem 64-5    Source:   Problem elaborated by the author's of the site.

Look at the circuit shown in Figure 64-05.1 . Assume that V_i varies randomly between 16 V and 22 V, and The load for the zener is formed by some resistors that can be activated by switches. Additionally, there is a variable load of 0 to 80 mA. Determine the values of R_S and the power dissipated by the zener and also in R_S .

Problem 64-6    Source:   Problem elaborated by the author's of the site.

Look at the circuit shown in Figure 64-06.1. Assume that R_S = 150 Ω, V_Z = 12 V and the input voltage is constant value V_i = 30 V. We know that the maximum power that the zener supports is 1 W and the minimum zener current is 5 mA. If the load is purely resistive, determine the maximum and minimum load that the circuit can support.

Problem 64-7    Source:   Problem elaborated by the author's of the site.

Look at the circuit shown in Figure 64-07.1. Assume that V_Z1 = 12 V, V_Z2 = 5 V, R_L1 = 200 Ω, P_Z1 = 1 W, P_Z2 = 0.5 W and the input voltage is constant in value V_i = 18 V. On the other hand, the charge R_L2 consumes a variable current between 20 mA and 50 mA. Determine the values of R_S1 and R_S2 for the circuit to function properly.

Problem 64-8    Source:   Problem elaborated by the author's of the site.

Look at the circuit shown in Figure 64-08.1. Assume that V_Z1 = 12 V, V_Z2 = 5 V, R_L = 200 Ω, P_Z1 = 1 W, P_Z2 = 0.5 W, and as input voltage we have two sources in series, where V_i = 22 V and V_S = 5 sin ω t V. On the other hand, R_L and the zener Z₂ are part of a lithium battery charger, whose nominal voltage is 3.7 V. When the lithium battery reaches a voltage of 4.0 V, R_C must ensure that no current flows greater than 10 mA (charge maintenance current) by the battery. Determine the values of R_S1, R_S2 and R_C for the circuit to function properly.