3.68 A digital circuit is required to display a digital signal on a bar-graph LED, similar to a sound meter on a stereo. You know that the input to your circuit has values from 0 to 3 coded in binary format. You need to indicate the value in a bar graph where pro- gressively more LEDs turn on as the input number gets higher, as shown in Fig- ure 3.120. When the highest number is reached, all LEDs are on. a. Write the truth table for the circuit required to drive the LEDs. Assume that the inputs are called D₁ and Do and the outputs are Y₁, Y2, and Y3, where Y₁ is the low- est LED in the diagram in Figure 3.120 and Y3 is the highest. Assume that the out- puts are active-HIGH. b. Write and simplify the Boolean equations for the three outputs. Draw a logic cir- cuit to show how the simplified functions can be implemented. D₁ Do= 00 01 10 11

3.68 A digital circuit is required to display a digital signal on a bar-graph LED, similar to a sound meter on a stereo. You know that the input to your circuit has values from 0 to 3 coded in binary format. You need to indicate the value in a bar graph where pro- gressively more LEDs turn on as the input number gets higher, as shown in Fig- ure 3.120. When the highest number is reached, all LEDs are on. a. Write the truth table for the circuit required to drive the LEDs. Assume that the inputs are called D₁ and Do and the outputs are Y₁, Y2, and Y3, where Y₁ is the low- est LED in the diagram in Figure 3.120 and Y3 is the highest. Assume that the out- puts are active-HIGH. b. Write and simplify the Boolean equations for the three outputs. Draw a logic cir- cuit to show how the simplified functions can be implemented. D₁ Do= 00 01 10 11

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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