Digital Circuits for High School Students

Part 1 Work Sheet
Prepared by Charles S. Tritt, Ph.D.
July 18, 1997

Output Voltage Levels

 ExpectedObserved
+5V  
No Load Pulser Low  
No Load Pulser High  
Loaded Pulser Low  
Loaded Pulser High  

Comments:

 

 

 

 

LED Input Responses

Voltage
TargetActualLED Status
Initial Off
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0 Bright

    Comments:

Truth Tables

Inverter or NOT (7404)
InputOutputs (Y's)
AExpectedObserved
01 
10 
AND (7408)
InputsOutputs (Y's)
ABExpectedObserved
000 
010 
100 
111 

Comments:

 

 

 
OR (7432)
InputsOutputs (Y's)
ABExpectedObserved
00  
01  
10  
11  
NAND (7400)
InputsOutputs (Y's)
ABExpectedObserved
00  
01  
10  
11  

Comments:

 

 

 

Simple Combinational Logic Circuit

Use the terms On, Off and Flashing to describe the tail light status.

InputsOutput
Turn SignalHazardBrakeLight
000 
001 
010 
011 
100 
101 
110 
111 

Comments: