PS 141 (CS) Electronics for
Computer Science Sophomores
 
 
learning elements
to be reflected in group lab reports

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1 - who are 1's and 0's anyway?
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Lab Report Number 1 - To be submitted by each group.

a. What purpose do the resistors have in the Step 1 & Step 2 diagrams.
b. How do you recognize 1's and 0's using the circuit you built in Step 3? Give a brief explanation.
c. What is the purpose of the capacitor and resistor to control the speed of the change from "1" and "0" in the diagram. Give a brief explanation.
d. How does the 555 run an "oscillator"? Give a brief explanation.
 

2 - counting up and down
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Lab Report Number 2 - To be submitted by each group.

Part A - Operating the 7490 counter.

a. What is the function of pins 2 and 3?
b. What happens when any of these pins (2 or 3) are raised to logic "1"?
c. What is the function of pins 6 and 7?
b. What happens when any of these pins (6 or 7) are raised to logic "1"?
e. What is the purpose of connecting pin 1 to pin 12?
f. What are the output pins?

Part B - Operating the 7442 BCD-to-decimal decoder.

a. What are the input pins of the 7442?
b. How did you connect them to the 7490?
c. Describe the behavior of the LEDs connected to the outputs of the 7442?

Part C - Operating the 7447 seven-segment decoder.

a. What are the input pins of the 7447?
b. How did you connect them to the 7490?
c. Describe the behavior of the LEDs connected to the outputs of the 7447?

Part D - General Observations.

If you were to describe the experiment to your 12-year old younger brother or sister, or to your mother, how would your description read?


 

3 - making decisions (logic gates / selectors / multiplexer / demultiplexer)
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Lab Report Number 3 - To be submitted by each group.

A. What inputs did your 0110 black box detect?

B. What output did it give?

C. How did you connect your black box to the 7490?

D. What did it do to the 7490?





 

4 - analog switches (diodes / transistors / operational amplifiers)
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Lab Report Number 4 - In two parts and to be submitted by each group.

Part A - Diode Switches

a. Give the "Truth Table" for the diagram in part A. What is the general name for such a circuit?


b. Give the "Truth Table" for the diagram in part B. What is the general name for such a circuit?




Part B - Transistor Switches

a. Identify all the elements of the circuit.
b. Describe in detail the behavior of each of the elements of the circuit.
c. Why do you use a transitor in this case to switch a lamp?





 

5 - op-amp analog applications
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Lab Report Number 5 - In four parts and to be submitted by each group.

Part A - Basics of Operational Amplifiers

a. In your own words, describe the functions of pins 2, 3, and 6 of a 741 OpAmp.
b. What voltages do pins 4 and 7 accept?


Part B - Behavior of Operational Amplifiers

In your own words, describe how the output of a 741 would behave if the inverting input is grounded and the non-inverting input is brought to +1.5 volts, and later to -1.5 volts. R(f) = 100 kilo-ohms and R(i) = 50 kilo-ohms.


Part C - Exercise 5

Give a comprehensive description of this experiment in your own words.


Part D - Applications

Where would you expect operational amplifiers to be used.









 

6 - transistor analog applications
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7 - allocated for specific interests
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