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Academics – Electro-Technology : 2010/DEC/03
Question

Q7. Fig Q3 shows a basic voltage stabilising circuit using a Zener diode and a series resmor. The Zener diode has a breakdown voltage of 12 V and is rated at 2 W maximum dissipation. The diode requires a minimum reverse current of 2 mA for satisfactory stabilisation and its slope resistance is negligible

Calculate EACH of the following:

(a) The maximum safe input voltage when the output current is zero;

(b) The maximum output current for satisfactory stabilisation when the input voltage is 18 volts.

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