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Q. 5(20 points) Design a transistor amplifier to supply a LED. The LED is required to turn on and off following the on/off signal from a digital output port of a microcomputer. VoFF = 0 V, Îmicroprocessor 5 mA,Vcc-5V, Vy (for the transistor) = 0.7 V, ? = 95, VCE at- Assume that the current needed to derive the LED is LED-10 mA. RB = 1 K ?, VON=5V: 0.2 VyLED (for the LED)-1.4 V, , Pmax-200 mW. Provide the circuit diagram for this design and find the range of Re that will enable a sufficient current to derive the LED on and off.

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LEo.LED et Le 3.냐 Ре 3. 328132 3ひ =g.0233-L 30 13-64

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