Lab 2 Report

Lab 2 Report - O bjective(s): In this lab, the students...

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Objective(s): In this lab, the student’s objective is: To determine the effects of performing wiring incorrectly: o Thermally o Electrically To electrically connect three-state and open-collector buffer circuits to drive a common communication bus [1]. Expected Outcome(s): The expected outcome is: To be able to measure electrical voltage correctly. To be able to detect and recognize thermal and electrical effects of driving a common point with two conflicting output signals [1]. To be able to describe different ways in which common-collector and three- state buffers circuits must be controlled to drive a common bus [1]. To be able to eclectically connect open-collector and three-state buffer circuits to drive a common communication bus [1].
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Results: Task 2.1 Effects of Missing Inputs to TTL Gates Task Statement: The task was to build an incorrect circuit where the inputs are missing. The task stated to embed a 7404 IC (hex inverter) into a breadboard circuit and connect the ground and V cc pins. The input was connected to the switch and the voltage across the input and the output was measured with respect to the ground. Figure 1 – Schematic of Measuring Voltages V in and V out The voltages of V in and V out were measured where the input was 0, 1 and disconnected. The results are in the table below. Input V in V out 0 0.02 V 4.54 V 1 5.05 V 130.9 mV No input 1.38 V 130.8 mV Table 1 – Voltage Input/Outputs of Connect/Disconnected Inputs
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When the input is disconnected, the voltmeter reads the potential difference that is automatically given when the IC is connected to the breadboard. When there is no input connection, the NOT gate inherits 1.38 V to give an output of 130.8 mV which is virtually 0V. In this task, I learned that an IC should always be connected to inputs or else a random value will be allocated as the input. I also learned that when a NOT gate has no input, the allocated input will make the output 0V.
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Task 2.2 Observe How Hot the Chips Get Task Statement: The task is to use the back of the finger to feel how hot the chip is. Using the back of my finger, due to the back of the fingure being more sensitive than the tip, the temperature of the chip was room temperature. In this task, I learned that miswiring chips can casue the chip to become hot which can be
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Lab 2 Report - O bjective(s): In this lab, the students...

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