Q3: a) In the regulator circuit of Figure 3, Determine Rext if the maximum internal regulator current is to be 250 mA. b) Using a 7812 voltage regulator and a 10 N load, how much power will the external pass transistor have to dissipate? The maximum internal regulator current is set at 500 mA by Rext: c) Show how to include current limiting in the circuit of Figure 3. What should the value of the limiting resistor be if the external current is to be limited to 2 A? d) Using an LM317, design a circuit that will provide a constant current of 500 mA to a load. Qext 15 VO Rext o VOUT 7809 Figure 3

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