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LAB REPORTS

Lab 1: Comparators and Oscillators

This experiment deals with the behavior of comparators and oscillators using a 311 comparator IC.  Section A of this experiment deals with a standard comparator IC.  The slew rates, settling time, bandwidth, and 3dB points will be measured and compared to the values of a 411 op-amp.  Through Section A, the normal operation of a 311 comparator IC will be observed. 
            In section B, a Schmitt trigger will be constructed in order to analyze its behavior.  The added positive feedback of the Schmitt trigger will allow the output to be rid of oscillations that are normally apparent for comparator outputs.  The hysteresis voltage will be determined and discussed in this section.
            Lastly, Section C will demonstrate the behavior of an RC oscillator.  The RC oscillator is created by adding negative feedback and a capacitor to the Schmitt trigger, and removing the input.  A square wave output will be observed without the use of any input. 

Lab 2: The 555 Timer

This experiment deals with different applications of the 555 Timer.  One shot circuit and oscillator behavior will be demonstrated.  Section A uses the 555 Timer as a one-shot circuit.  As a one-shot circuit the 555 Timer will be shown to act as a monostable multivibrator.  Once triggered, this circuit will light an LED for a certain defined period of time, depending on the capacitor used in the circuit.
            Section B demonstrates the 555 Timer as a timer-based oscillator.  The timer outputs a periodic pulse of frequency .  The different configuration of the resistors in this oscillator allows you to change the period as well as reset the whole comparator.
            Section C uses the 555 Timer as a sawtooth oscillator in which a sawtooth waveform is generated.  A transistor is added to the circuit in order to generate this waveform.

Lab 3: Digital Inputs and Ouputs

This experiment utilizes LabVIEW digital acquisition devices in order to demonstrate digital input and output operations.  The DAQ’s used in the lab have twelve digital inputs and outputs that are either open-collector or active drive settings.  The open collector configuration is the default for DAQ output ports.  This setting sets the operation to be at 5V, with a 4.7kΩ pull-up resistor.  When the output is set to active drive settings, only 3.3V operation is allowed with a current limit of plus or minus 8.5mA. 
            Section A of this experiment deals with digital input and output of a DAQ device.  The first experiment will demonstrate the use of LabVIEW to create a VI file to show the basic correlation between the manual switching on the digi-boxes and the LED indicators on the LabVIEW program.  Section A will vary the displays of the outputs in order to demonstrate the various types of outputs that can be utilized.  Lastly a given VI will be used to output the binary equivalent to the birthdays of the individuals in lab.
            Section B demonstrates the operation of a 74151 8-bit multiplexer.  This multiplexer has selector inputs that chooses a certain data input to be displayed on a single output. 
            Lastly Section C will demonstrate the output of a 74151 multiplexer using the DAQ hardware and a generated VI.  The three selector inputs of the multiplexer will be controlled by the VI and the output will be generated on a waveform chart.

Lab 4: IC Counters

In this experiment mod-7 and mod-14 counters were made using a 74192 counter chip and combinations of other IC chips. In addition to the counters, a counter tha twould count to 34 was created using a counter, an AND gate, an OR gate, two LED drivers, and two LED displays. Lastly the behavior of a frequency detector was analyzed.

Lab 5: Fiber Optics Transmission

This experiment deals with the fiber optic transmission of strings using the DAQ device. A transmitter and transmitter VI were written in order to translate the string into a series of flasshes of light from the fiber optic cable. A receiver and receiver VI were also generated in order to translate the flashes back into the string.

Lab 6-7: DAC & ADC in LabVIEW & Applications

This experiment had us play around with digital to analog converters and analog to digital converters. Lots of fun VIs were created for this lab so take a look :)

Lab 8: Motor Control

This experiment entailed controlling a motor that spun a cd with a given number of notches in it. With LabVIEW we were to control the motor so that it would hone in on a specified frequency as defined by the user.

 

LABVIEW ASSIGNMENTS

~All LabVIEW assignments must be viewed in Version 8.0 or higher in order to be run~

COMPLEX.VI - Performs various functions on complex numbers.
FILTER.VI - Demonstrates the operation of a high and low pass filter.
JKFF.VI - Demonstrates the basic functions of a JK Flip Flop.
GRAPH.VI - Manipulates the function f(x) = A*x^4 + B*x^2 + C. It can take the derivative, definite integral, and square root of various forms of the function.

COUNTER.VI - Demonstrates the operation of a MOD-N counter (N from 2-16). NOTE: You will need the JKFF VI's below in order to operate the counter.

 
OPAMP.VI - Demonstrates the function of a differentiator op-amp circuit. This circuit takes the derivative of whatever input wave and displays it on the output.

MUXDEMUX.VI - Demonstrates the operation of a multiplexer and a demultiplexer.

In order to run this VI you must also download these sub VI's:

 
 

SPECIAL PROJECTS

~Below are some special projects that compile all of the knowledge that I have learned thus far~

LOCK PROJECT - This project is a digital lock especially designed to keep terrorists out of my deepest darkest secrets. Included is a review of how my lock was constructed, ENJOY!

WAVEFORM GENERATION LABVIEW PRESENTATION - LabVIEW VI that can show you all of the fun different types of waveform generation.

FILTER PROJECT - Rupa, Sagar, and I combined our masterminds to create a bandpass filter made from a biquad filter and a twin t chebyshev filter. This is our final report that we handed in to Dr K.

SPECIAL PROJECT POWERPOINT

SPECIAL PROJECT WRITE-UP

Neuronal Unit Impulse Recorder - consisted of creating a LabVIEW VI that would identify the zero crossing of an incoming signal, plot each of those zero crossings, analyze each signal, and plot acceptable waveforms as defined by the user. Above are my powerpoint and brief write-up of the project.

Two of my favorite pictures taken this year - A tribute to Electronics 351