2008_jajt_probCIR_completo2ndEd

# To get to the final solution authors advise students

• 153

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to get to the final solution, authors advise students to study once more the theoretical contents related to the problem. The text has been written in order to be studied in a sequential way. This means that a difficulty found by a student in a particular problem may have been solved in a previous one. At the beginning of the book, there are some chapters devoted to Circuit Theory. Their problems, proposed in exams as well, aim to prepare the student for the many equivalent electrical circuits that appear in any electronic circuit. As a result of the transformation of an electronic device into its electrical model, some elements can be considered superfluous (passive elements in parallel with a voltage source, or in series with a current source). The text insists on circuits with such features because experience shows that they are difficult to understand. Another reference related Circuit Theory can be found in a book by the same authors. 2 2 ”Fundamentos de Teor´ ıa de Circuitos para Electr´onica”, Juan A. L´ opez Villanueva, Juan A. Jim´ enez Tejada, 2008. V

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´ Indice general 1. Circuitos el´ ectricos en condiciones de corriente continua. 1 2. Respuesta transitoria. 7 3. Circuitos el´ ectricos en condiciones de corriente alterna. 13 4. Dominio de la transformada de Laplace. Funci´ on de transferencia. Fil- tros. 29 5. Semiconductores. 39 6. Circuitos con diodos. 43 7. Polarizaci´on de transistores. 61 8. Familias l´ ogicas. 79 9. El transistor como amplificador. 93 10.El amplificador operacional. Aplicaciones. 107 11.Convertidores A/D. 129 Anexo 132 I. Transformada de Laplace. 133 VII

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1 Circuitos el´ ectricos en condiciones de corriente continua. 1

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2 1. Circuitos el´ ectricos en condiciones de corriente continua. Problema 1.1 Obtenga el circuito equivalente de Th` evenin ( V T , R T ) de la red de la figura vista desde A y B. Problema 1.1 Soluci´on: Como la fuente de tensi´ on es continua, el condensador se comporta como un circuito abierto. Adem´ as, la resistencia colocada en paralelo con la fuente de tensi´ on no afecta para nada al valor de la tensi´ on entre A y B. El circuito se reduce, por tanto, a un divisor de tensi´ on. V AB = V/ 2, R T = R bardbl R = R/ 2, es decir, V T = 2 . 5 V y R T = 500 Ω Problema 1.2 En la figura se encierra entre l´ ıneas de trazos el circuito equivalente de una fuente de tensi´ on (valor nominal 12 V y resistencia interna de 2 Ω ) conectada a una resistencia de 5 k Ω . Si por error conectamos en paralelo a los extremos de la resistencia un amper´ ımetro que tiene 1.5 Ω de resistencia interna (no dibujada en la figura), calcule la corriente que circular´ ıa por el amper´ ımetro. ¿Qu´ e ocurrir´ ıa si este tiene un fusible de protecci´ on de 0.2 A en serie con su resistencia interna?
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