voltage regulator

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Joined Sep 16, 2005
consider a circuit in which power supply voltage is of +12V
a zener diode [Vz=9.1V] is connected to power supply through a resistance of 100ohms
Izk=5mA, load current can vary from 0mA to 15mA
when we connect a load resistance of 100ohms across zenerdiode then diode is drop out of the circuit and voltage drop across RL become 6Volts
Can we design voltage regulater circuit using zener diode such that when we connect load of 100ohms,its voltage drop remains 9 volt , i.e;zener diode operates normally???????