ELECTRICAL ENGINEERING

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Overview: Understanding the de-bounce switch circuitry

Resources to consult:  Digital Electronics: Principles and Applications, 8th Edition, Chapter 5, Figure 5-14b

Instructions:

Build the circuit as shown in Figure 5-15b

Capture the output switch from high to low and low to high and paste into your document

At the bottom of your lab report, describe the operation of the de-bounce switch and give examples of the uses.

Week 2 Lab

 

Overview:  Understanding the decoding circuitry of a BCD to seven segment display

Resources to consult:  Digital Electronics: Principles and Applications, 8th Edition, Chapter 6

Exercise:

1.     Construct a BCD to seven segment display circuit. Do not use a BCD to seven segment display chip!

2.     Circuit should be constructed of AND, NOT OR etc. gates

3.     Use switches for BCD input data

4.     Describe operation of the circuit. Capture output of seven segment display with BCD switches in different positions.

Week 3 Lab

 

Overview:  Understanding the counter circuit including reset

Resources to consult:  Digital Electronics: Principles and Applications, 8th Edition, Chapter 8

Instructions:

1.    Construct a 2 digit counter that counts from 00 to 60

2.    You can use the BCD to seven segment display for the output

3.    You can use a switch to clock the input or a clock pulse.

4.    First digit will count from 0 to 9 (modulo 10 counter) and reset back to zero. Resetting to zero should clock the next chip to increment.

5.    Second digit will count from 0 to 6 (modulo 6 counter) and reset back to zero.

6.    Describe operation of the circuit. Capture output of seven segment display at various times

Week 4 Lab

Overview:  Understanding the shift register constructed as a ring counter

Resources to consult:  Digital Electronics: Principles and Applications, 8th Edition, Chapter 9

Instructions:

1.    Construct a 6 position ring counter and output to a seven segment display outer LEDs (do not use center LED)

2.    The lights should travel in a ring around the seven segment display

3.    Hint: You do not want to use a BDC to seven segment decoder

4.    Circuit will power up with one light on.

5.    Pressing a switch will cause the ring counter to loop until the switch is released.

6.    Describe operation of the circuit. Capture output of seven segment display at various times.

Week 5 Lab

Overview:  Understanding a 2’s complement 4 bit adder circuit

Resources to consult:  Digital Electronics: Principles and Applications, 8th Edition, Chapter 10

Instructions:

1.     Construct a 4 bit 2’s complement adder circuit using discrete components (and, or, xor etc)

2.     Display the result on 2 seven segment displays, one for sign and one for number

3.     If the number if positive, use BCD to seven segment to display output

4.     If the number is negative, invert every signal, use another 4 bit adder and add a one, then use a BCD to seven segment to display output

5.     Describe operation of the circuit. Capture output of seven segment for max, min and in between values.

Week 6 Lab

 

Overview:  Understanding memory

Resources to consult:  Digital Electronics: Principles and Applications, 8th Edition, Chapter 11

Instructions:

1.    Using the HM6116A120 (2Kx8 ram) create an addressable RAM circuit and perform the following:

2.    Choose several address locations (not 0) and write the inverse of the address as data to that location.

a.    Address is 0110 Data should be 1001

3.    Read the memory in the following order: Read location 0 (this should be 0), Read the first location you wrote to, capture screen data, read the second location you wrote to, capture screen, etc.

4.    Describe operation of the circuit. Capture output of seven segment for max, min, and in between values.

Week 7 Lab

 

Overview:  Understanding D/A and A/D convertors

Resources to consult:  Digital Electronics: Principles and Applications, 8th Edition, Chapter 14, Figure 14-12

Instructions:

1.    Construct the digital meter as shown in Figure 14-12 in the book with the following modifications:

2.    Instead of a seven-segment display, use a bar display that lights up the number of bars in the voltage

3.    You will need to replace the BCD to seven-segment display and the display

4.    If the voltage is 4 volts, bars 4, 3, 2, and 1 will be lit.

5.    Describe operation of the circuit. Capture output of the bar display along with the input voltage display.

Week 8 Lab

The student will construct a digital alarm clock using basic logic components. The clock will consist of a timer circuit, a divide by 6 counter, a decade counter, and a display module. The alarm will be set by switches in BCD notation and the alarm itself will be instrumented by attaching a light which will illuminate when the alarm time and the clock time match.

The circuit will use the following components:

Timer (555)

7 segment display

Rules for lab submissions: 1. The lab document must be a Word document. PDF files are NOT accepted. 2. All screenshots must be included. 3. All screenshots must include the Multisim time stamp. 4. Any and all Multisim files must be submitted. 5. Any equations used must be typed in Word. Copy and paste of equations from outside sources is prohibited. 6. No graphics are allowed in the Word document other than screenshots of circuits from Multisim with the time stamp. 7. The lab template should be used. Specifically, it is brought to your attention that a summary MUST be provided explaining the results of the labs, the relationship of the results to expected results, and any challenges encountered. 8. All resistors must be have a tolerance of at least 5% set. Thus, your measured values should NOT be exactly equal to your calculated values. Any violation of the submission rules above will result in a grade of 1. • Please use different color wires if you are comparing 2 different waves on the Oscope • Please use the “capture screen area” tool in Multisim so that you only have a screen shot of the time stamp, the circuit, measuring devices and readouts (I don’t need to see the rest of your screen and Multisim)

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