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PN junction of zener diode is heavily doped than ordinary diode. For the occurrence of Zener effect the zener diode is heavily doped. If the zener diode is not heavily doped then Zener effect will not occur. When the zener diode is heavily doped depletion layer become very narrow. If the diode is heavily doped The breakdown voltage is sharp. If the diode is lightly doped the diode will have higher breakdown voltage.

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Description : Can we use a zener diode as a rectifier?

Description : While studying the V-I characteristics of a zener diode, there are two different values of resistors connected in series with it. In case of the forward characteristics, a ~70 ohm resistor is connected ... ~510 ohm resistor. What is the reason behind it ? Is the difference really necessary ?

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