2. For the circuit of Figure 2-6, if R₂ = 10 k2 and (a) R₁ = 1 k2, (b) R₁ = 10 kn, and (c) R₁ = 47 k2, what is the input voltage (V) to make the LED lit for each of three values of R₁ above?

2. For the circuit of Figure 2-6, if R₂ = 10 k2 and (a) R₁ = 1 k2, (b) R₁ = 10 kn, and (c) R₁ = 47 k2, what is the input voltage (V) to make the LED lit for each of three values of R₁ above?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Concept explainers

Z parameter

The Z-parameters that are the impedance parameters of a two-port network are defined by expressing the two-port voltages V1 and V2 in terms of two-port currents I1 and I2. The Z-parameters are calculated by open circuiting one of the two ports at a time henceforth they are called open-circuit impedance parameters.

Question

2. For the circuit of Figure 2-6, if R₂ = 10 kQ and (a) R₁ = 1 kQ, (b) R₁ = 10 kQ,
and (c) R₁ = 47 k2, what is the input voltage (V) to make the LED lit for each
of three values of R₁ above?
+15 V
100 ΚΩ
+15 V
ΙΚΩ
+15 V
V₁
3
6 100 ΚΩ
741
2N3904
R₂ VREF 2
+15 V M
10 ΚΩ
1N914
R₁
-15 V
ΙΚΩ
Figure 2-6

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Step 3: (a) For R1=1 kilo-ohm

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Step 4: (b) For R1=10 kilo-ohm

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Step 5: (c) For R1=47 kilo-ohm

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