A simple shunt regulator .Resistor Rs drops the unregulated voltage by the amount that depends on the current supplied to the load , Rl.The voltage across the load is set by the zener diode and transistor base emitter voltage. If the load resistance decreases, a reduced drive current to the base of Q1 results, shunting less collector current. The load current is thus larger ,thereby maintaining the regulated voltage across the load. The output voltage is
VL=Vz+VBE
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