Zener Regulator Series Resistor

Rarely Tested

$$ R_s = \frac{V_{in} - V_Z}{I_Z + I_L} $$

Series resistor for Zener regulator where $$V_{in}$$ = input voltage, $$V_Z$$ = Zener voltage, $$I_Z$$ = Zener current, $$I_L$$ = load current.

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