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The secondary voltage is $12.6 V_{\text {rms }}$ when the line voltage is $115 V_{\text {rms }}$. During the day, the power line varies by $\pm 10$ percent. The resistors have tolerances of $\pm 5$ percent. The $1 \mathrm{~N} 4733 \mathrm{~A}$ has a tolerance of $\pm 5$ percent and a Zener resistance of $7 \Omega$. If $R_2$ equals $560 \Omega$, what is the maximum possible value of the Zener current at any instant during the day?
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Using the worst case condition that maximize the zener current ,

$V_{sec(max)}$

$R_{1(max)}$,$R_{2(min)}$

$V_{z(min)}$

Ripple peak
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