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Full Wave Rectifier

Consider a vo...

Question

Consider a voltage regulator circuit shown in the figure below:

The circuit is connected to a supply voltage of $v_{i n} = 20 V .$ The circuit consists of a BJT with $β = 99$ and $V_{B E} = 0.7 V$ . The value of current $I_{z}$ is equal to _______ $μ A .$
907

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Solution

The correct option is A 907

$\begin{matrix} I_{z} + I_{B} & = I_{1} I_{z} & = I_{1} - I_{B} V_{0} & = V_{Z} - V_{B E} = 10 - 0.7 = 9.3 V I_{E} & = \frac{V_{0}}{1 k Ω} = \frac{9.3 V}{1 k Ω} = 9.3 m A I_{B} & = \frac{I_{E}}{β + 1} = \frac{9.3}{100} = 93 μ A I_{1} & = \frac{20 - 10}{10 k} = 1 m A I_{z} & = (1000 - 93) μ A I_{z} & = 907 μ A \end{matrix}$

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