ENGINEERING CIRCUIT...(LL)>CUSTOM PKG.<
9th Edition
ISBN: 9781260540666
Author: Hayt
Publisher: MCG CUSTOM
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Textbook Question
Chapter 4, Problem 73E
The LED circuit in Fig. 4.89 is used to mix colors to achieve any desired color in the RGB color palette. Use LTspice and the circuit model representing LEDs as voltage sources to see how changing the resistance R1 from 100 to 1 kΩ affects the color, with the other resistors fixed at R2 = R3 = 100 Ω. You can do this using a parameter sweep statement by defining a variable such as {rvariable} (including the curly brackets) in the value for R1. Then include a SPICE directive such as .step param rvariable 100 1k 20 to step the variable from 100 to 1000 in steps of 20. (a) Plot the current of all three LEDs as a function of R1 and explain the result. (b) Find an RGB color chart and describe how the color changes with R1, increasing from 100 to 1 kΩ. (c) Find a value of R1 that could be used to achieve a khaki color approximating RGB hex code C2BD23, RGB (194,189,35).
FIGURE 4.89
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Chapter 4 Solutions
ENGINEERING CIRCUIT...(LL)>CUSTOM PKG.<
Ch. 4.1 - For the circuit of Fig. 4.3, determine the nodal...Ch. 4.1 - For the circuit of Fig. 4.5, compute the voltage...Ch. 4.1 - For the circuit of Fig. 4.8, determine the nodal...Ch. 4.2 - For the circuit of Fig. 4.11, compute the voltage...Ch. 4.3 - Determine i1 and i2 in the circuit in Fig. 4.19....Ch. 4.3 - Determine i1 and i2 in the circuit of Fig 4.21....Ch. 4.3 - Determine i1 in the circuit of Fig. 4.24 if the...Ch. 4.4 - Determine the current i1 in the circuit of Fig....Ch. 4.4 - Determine v3 in the circuit of Fig. 4.28. FIGURE...Ch. 4 - Solve the following systems of equations: (a) 2v2 ...
Ch. 4 - (a) Solve the following system of equations:...Ch. 4 - (a) Solve the following system of equations:...Ch. 4 - Correct (and verify by running) the following...Ch. 4 - In the circuit of Fig. 4.35, determine the current...Ch. 4 - Calculate the power dissipated in the 1 resistor...Ch. 4 - For the circuit in Fig. 4.37, determine the value...Ch. 4 - With the assistance of nodal analysis, determine...Ch. 4 - Prob. 9ECh. 4 - For the circuit of Fig. 4.40, determine the value...Ch. 4 - Use nodal analysis to find vP in the circuit shown...Ch. 4 - Prob. 12ECh. 4 - Prob. 13ECh. 4 - Determine a numerical value for each nodal voltage...Ch. 4 - Prob. 15ECh. 4 - Using nodal analysis as appropriate, determine the...Ch. 4 - Prob. 17ECh. 4 - Determine the nodal voltages as labeled in Fig....Ch. 4 - Prob. 19ECh. 4 - Prob. 20ECh. 4 - Employing supernode/nodal analysis techniques as...Ch. 4 - Prob. 22ECh. 4 - Prob. 23ECh. 4 - Prob. 24ECh. 4 - Repeat Exercise 23 for the case where the 12 V...Ch. 4 - Prob. 26ECh. 4 - Prob. 27ECh. 4 - Determine the value of k that will result in vx...Ch. 4 - Prob. 29ECh. 4 - Prob. 30ECh. 4 - Prob. 31ECh. 4 - Determine the currents flowing out of the positive...Ch. 4 - Obtain numerical values for the two mesh currents...Ch. 4 - Use mesh analysis as appropriate to determine the...Ch. 4 - Prob. 35ECh. 4 - Prob. 36ECh. 4 - Find the unknown voltage vx in the circuit in Fig....Ch. 4 - Prob. 38ECh. 4 - Prob. 39ECh. 4 - Determine the power dissipated in the 4 resistor...Ch. 4 - (a) Employ mesh analysis to determine the power...Ch. 4 - Define three clockwise mesh currents for the...Ch. 4 - Prob. 43ECh. 4 - Prob. 44ECh. 4 - Prob. 45ECh. 4 - Prob. 46ECh. 4 - Prob. 47ECh. 4 - Prob. 48ECh. 4 - Prob. 49ECh. 4 - Prob. 50ECh. 4 - Prob. 51ECh. 4 - Prob. 52ECh. 4 - For the circuit represented schematically in Fig....Ch. 4 - The circuit of Fig. 4.80 is modified such that the...Ch. 4 - The circuit of Fig. 4.81 contains three sources....Ch. 4 - Solve for the voltage vx as labeled in the circuit...Ch. 4 - Consider the five-source circuit of Fig. 4.83....Ch. 4 - Replace the dependent voltage source in the...Ch. 4 - After studying the circuit of Fig. 4.84, determine...Ch. 4 - Prob. 60ECh. 4 - Employ LTspice (or similar CAD tool) to verify the...Ch. 4 - Employ LTspice (or similar CAD tool) to verify the...Ch. 4 - Employ LTspice (or similar CAD tool) to verify the...Ch. 4 - Verify numerical values for each nodal voltage in...Ch. 4 - Prob. 65ECh. 4 - Prob. 66ECh. 4 - Prob. 67ECh. 4 - Prob. 68ECh. 4 - Prob. 69ECh. 4 - (a) Under what circumstances does the presence of...Ch. 4 - Referring to Fig. 4.88, (a) determine whether...Ch. 4 - Consider the LED circuit containing a red, green,...Ch. 4 - The LED circuit in Fig. 4.89 is used to mix colors...Ch. 4 - A light-sensing circuit is in Fig. 4.90, including...Ch. 4 - Use SPICE to analyze the circuit in Exercise 74 by...
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