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3.9: Exercises
https://eng.libretexts.org/Workbench/Electronics_(Final)/03%3A_Physics_of_BJTs/3.09%3A_Exercises
For the circuit of Figure $\PageIndex{2}$ , determine a value for $R_C$ to set the LED current to 15 mA. $V_{logic} = 5$ V, $V_{CC} = 5$ V, $V_{LED} = 1.6$ V, $R_B = 3.3$ k $\Omega$ . For t...For the circuit of Figure $\PageIndex{2}$ , determine a value for $R_C$ to set the LED current to 15 mA. $V_{logic} = 5$ V, $V_{CC} = 5$ V, $V_{LED} = 1.6$ V, $R_B = 3.3$ k $\Omega$ . For the circuit of Figure $\PageIndex{3}$ , determine a value for $R_C$ to set the LED current to 20 mA. $V_{logic} = 0$ V, $V_{EE} = 5$ V, $V_{LED} = 2.0$ V, $R_B = 2.7$ k $\Omega$ .

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