Lab # 4
Logic Gates and Truth Table
10/22/98
Adrian Brown
Abdul Habiballa
The pupose of this lab was to test a designed circuit using a proto-board. This lab was similar to the last one, the only difference is that the circuit is more complex.
To design and test the ciruit we needed the following
A proto-board
A 7408 chip This contains 4 2-inp
AND gates
A 7432 chip This contains 4 2-inp
OR gates
A 7404 chip This contains 6
inverters
For a more detailed view of the chips one can visit the Texas Instrument web site
schematic
To arrange this circuit we needed two of the AND gates an OR gate and an INVERTER. The chips were arranged in that order down the middle of the proto-board. Connections were made as shown in the diagram below. When ever we needed an input of zero the wire would be connected to the GND, and when we needed an input of one the wire would be connected to the 5V wire. The results would then be noted by the LED. An output of one would give a light, zero would not affect it. For each chip the VCC and the GND must be connected to prevent the chip from burning up
Truth Table
These were the results that we shold have gotten; however, due to faulty equipement we did not. The results were confirmed for the circuit in the b^2 logic simulator.
The lab did not work well this time. The proto-boards were not giving the correct results. we did become more familiar with a more complex circuit.
Adrian Brown